Fix double exception in tube.remote when getaddrinfo raise gaierror

[tesuji]

Before:

[-] Opening connection to pwn.ctf.umasscybersec.org on port 9000: Failed
[ERROR] Could not resolve hostname: 'pwn.ctf.umasscybersec.org'
Traceback (most recent call last):
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 85, in __init__
    self.sock   = self._connect(fam, typ)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 113, in _connect
    for res in socket.getaddrinfo(self.rhost, self.rport, fam, typ, 0, socket.AI_PASSIVE):
  File "/usr/lib/python3.10/socket.py", line 955, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/ctfs/2025/umass/pwn/calc/run.py", line 76, in <module>
    r = conn()
  File "/home/user/ctfs/2025/umass/pwn/calc/run.py", line 50, in conn
    r = remote(host, int(port), ssl=args.SSL)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 89, in __init__
    self.error('Could not resolve hostname: %r', host)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/log.py", line 438, in error
    raise PwnlibException(message % args)
pwnlib.exception.PwnlibException: Could not resolve hostname: 'pwn.ctf.umasscybersec.org'

After:

[-] Opening connection to pwn.ctf.umasscybersec.org on port 9000: Failed
[ERROR] Could not resolve hostname: 'pwn.ctf.umasscybersec.org'
Traceback (most recent call last):
  File "/home/user/ctfs/2025/umass/pwn/calc/run.py", line 76, in <module>
    r = conn()
  File "/home/user/ctfs/2025/umass/pwn/calc/run.py", line 50, in conn
    r = remote(host, int(port), ssl=args.SSL)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 89, in __init__
    self.error('Could not resolve hostname: %r', host)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/log.py", line 438, in error
    raise PwnlibException(message % args) from original_exc
pwnlib.exception.PwnlibException: Could not resolve hostname: 'pwn.ctf.umasscybersec.org'

If using log.exception inside except block:

[-] Opening connection to pwn.ctf.umasscybersec.org on port 9000: Failed
[ERROR] Could not resolve hostname: 'pwn.ctf.umasscybersec.org'
    Traceback (most recent call last):
      File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 85, in __init__
        self.sock   = self._connect(fam, typ)
      File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 113, in _connect
        for res in socket.getaddrinfo(self.rhost, self.rport, fam, typ, 0, socket.AI_PASSIVE):
      File "/usr/lib/python3.10/socket.py", line 955, in getaddrinfo
        for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
    socket.gaierror: [Errno -2] Name or service not known
Traceback (most recent call last):
  File "/home/user/ctfs/2025/umass/pwn/calc/run.py", line 76, in <module>
    r = conn()
  File "/home/user/ctfs/2025/umass/pwn/calc/run.py", line 50, in conn
    r = remote(host, int(port), ssl=args.SSL)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 89, in __init__
    self.exception('Could not resolve hostname: %r', host)
  File "/home/user/venv/lib/python3.10/site-packages/pwnlib/tubes/remote.py", line 85, in __init__
    self.sock   = self._connect(fam, typ)
socket.gaierror: [Errno -2] Name or service not known

[tesuji]

Edit: We could use log.exception inside except block instead.
Based on this comment, maybe we move the log.error out of except block:

pwntools/pwnlib/tubes/remote.py

Line 89 in e841b50

self.error('Could not resolve hostname: %r', host)