vim: Move ftplugins into after/

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

.config/vim/ftplugin/python.vim

@@ -1,6 +0,0 @@
-" Use 4 spaces for indentation
-setlocal tabstop=4
-setlocal shiftwidth=0
-setlocal expandtab
-" Delete all 4 spaces when pressing backspace
-setlocal smarttab