runtime(vim): Update base syntax, improve :match highlighting

- Match the range prefix separately as a count.
- Match an explicit count of 1, rarely used but seen in the wild.
- Allow whitespace between the count and command.

closes: #17717

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

runtime/syntax/testdir/input/vim_ex_commands.vim

@@ -13,8 +13,6 @@
 : help
  : help # FIXME
 
-:2match
-:3match
 :append
     text
 .
@@ -598,8 +596,6 @@ call Foo() | help
 call Foo() |help
 call Foo()| help
 
-call Foo() | 2match
-call Foo() | 3match
 " FIXME
 call Foo() | append
     text