Default installation path is Program Files even in current-user mode

[wikeaka]

Describe the bug

The default installation path is "C:\Program Files," regardless of whether the installer is in all-user mode or current-user mode. The installer cannot modify the Program Files directory when in current-user mode, so I have to manually change the installation path.

"%LocalAppData%\Programs\CopyQ" (or somewhere the installer can modify without the UAC prompt) would be better for current-user mode.

To Reproduce

1. Run the installer.
2. Click "Install for me only."
3. Continue installing until the "Select Destination Location" section
4. Notice that the default location is "C:\Program Files."

Expected behavior

The default path is "%LocalAppData%\Programs\CopyQ" when in current-user mode.

Version, OS and Environment

• Application Version: 9.0.0
• OS: Windows 10

Additional Context

The developer mentioned in #1912 that Inno Setup should handle this issue previously, but it seems that a solution is now available.
https://jrsoftware.org/ishelp/index.php?topic=consts ("Auto Constants" section)

[hluk]

Not sure if this is worth fixing. Looks like a problem in Inno Setup that can be easily worked around by user providing a different path. I do not know where apps should be installed if not in "Program Files" and if Inno Setup itself cannot provide an alternative path.

But if you can provide a fix (a pull request), I would be probably OK with accepting it.