fish: fix usage of vim: syntax

fish/void-quick

@@ -1,4 +1,4 @@
-# vim: syntax=fish:
+#!/usr/bin/env fish
 
 function xqdir -d "Quickly sets up an environment for building packages"
 	$_agw_dir_src/packages/void/greyserv/copy

fish/void-repo

@@ -1,4 +1,4 @@
-# vim: syntax=fish:
+#!/usr/bin/env fish
 
 function xrreload -d "Reload all packages into the package repository"
 	set repo "$XBPS_HOSTDIR"/binpkgs

fish/wiki-preview

@@ -1,4 +1,4 @@
-# vim: syntax=fish:
+#!/usr/bin/env fish
 
 function wiki-preview -d "Preview a wiki page" -a wiki mdwn
 	scp "$mdwn" "$_agw_secret_ikiwiki_login":/tmp/test.mdwn