runtime(vim): Update syntax file (#14009)

- allow comments after :highight commands
- match the bang in a :highlight[!] command
- highlight the bang in :map[!], :menu[!] and :unlet[!] with vimOper
  like all other commands

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim_map.vim

@@ -0,0 +1,9 @@
+" Vim map commands
+
+map!
+map! lhs rhs
+map 
+map lhs rhs
+
+call map(list, 'v:val')
+call map (list, 'v:val')