Vim: remove unnecessary cursor position hack for Git commit messages
Vim: remove unnecessary cursor position hack for Git commit messages

This used to be necessary but is no longer
(`g:WincentCursorMkviewFiletypeBlacklist` means that we don't try to
restore cursor position in Git commit messages).

Started to scrutinize this line because the comment clearly applies to
some preceding code that is no longer there; I suspected some careless
reordering, but then drilled down to commit db36f7ff902d, where you can
see I removed the preceding code entirely.

It's true that removing this line means I'll be back in the old code
path without any special handling of Git commit messages when in a Vim
without `'mksession'` functionality, but to be honest, I don't actually
expect that to ever happen, so I prefer to just remove the clutter.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent