zsh:autoload:*: Add shebang & remove vim-modeline

By adding a shebang to the scripts they can be executed directly without
an interactive shell. The shebang also makes vims modeline that only set
the filetype obsolete.

.config/zsh/autoload/git-submodule-rm

@@ -1,3 +1,4 @@
+#!/usr/bin/zsh
 ## Author:  druckdev
 ## Created: 2020-09-13
 ##
@@ -29,5 +30,3 @@ for arg in "$@"; do
 
 	separator="\n"
 done
-
-# vim: ft=zsh