Revert "Fix #1186 - Use -w by default for Perl, which does not execute code"

This reverts commit f5fc746d00.

test/command_callback/test_perl_command_callback.vader

@@ -1,37 +0,0 @@
-Before:
-  Save g:ale_perl_perl_executable
-  Save g:ale_perl_perl_options
-
-  unlet! g:ale_perl_perl_executable
-  unlet! g:ale_perl_perl_options
-
-  runtime ale_linters/perl/perl.vim
-
-After:
-  Restore
-
-  unlet! b:ale_perl_perl_executable
-  unlet! b:ale_perl_perl_options
-
-  call ale#linter#Reset()
-
-Execute(The default Perl command callback should be correct):
-  AssertEqual
-  \ 'perl',
-  \ ale_linters#perl#perl#GetExecutable(bufnr(''))
-
-  AssertEqual
-  \ ale#Escape('perl') . ' -w -Mwarnings -Ilib %t',
-  \ ale_linters#perl#perl#GetCommand(bufnr(''))
-
-Execute(Overriding the executable and command should work):
-  let b:ale_perl_perl_executable = 'foobar'
-  let b:ale_perl_perl_options = '-c'
-
-  AssertEqual
-  \ 'foobar',
-  \ ale_linters#perl#perl#GetExecutable(bufnr(''))
-
-  AssertEqual
-  \ ale#Escape('foobar') . ' -c %t',
-  \ ale_linters#perl#perl#GetCommand(bufnr(''))