[fish] Remove perl from fish key bindings (junegunn#1635)

Perl was used to remove the trailing newline character, but fzf already
has --print0 to use null character as terminators, and fish read -z is
expecting null character as terminators. There is no reason to depend on
perl if --print0 is passed to fzf invocation.

shell/key-bindings.fish

@@ -47,7 +47,7 @@ function fzf_key_bindings
       # history's -z flag was added in fish 2.4.0, so don't use it for versions
       # before 2.4.0.
       if [ "$FISH_MAJOR" -gt 2 -o \( "$FISH_MAJOR" -eq 2 -a "$FISH_MINOR" -ge 4 \) ];
-        history -z | eval (__fzfcmd) --read0 -q '(commandline)' | perl -pe 'chomp if eof' | read -lz result
+        history -z | eval (__fzfcmd) --read0 --print0 -q '(commandline)' | read -lz result
         and commandline -- $result
       else
         history | eval (__fzfcmd) -q '(commandline)' | read -l result