vim: Move ftplugins into after/

All of these are meant as additions and should not override vims default
ftplugins.

.config/vim/ftplugin/gitcommit.vim

@@ -1,5 +0,0 @@
-" Shorter lines. Subject should be max 50 and body max 72
-setlocal colorcolumn=50,72
-setlocal textwidth=72
-" Spell checking always enabled
-setlocal spell spelllang=en