patch 9.0.0444: trying to declare g:variable gives confusing error

Problem:    Trying to declare g:variable gives confusing error.
Solution:   Give a better error message. (closes #11108)
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 636769d..80b7820 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -1936,7 +1936,7 @@
   var lines =<< trim END
       g:notexist:cmd
   END
-  v9.CheckDefAndScriptFailure(lines, ['E488: Trailing characters: :cmd', 'E121: Undefined variable: g:notexist'], 1)
+  v9.CheckDefAndScriptFailure(lines, ['E1016: Cannot declare a global variable: g:notexist', "E1069: White space required after ':'"], 1)
 
   lines =<< trim END
       g-pat-cmd
@@ -1950,7 +1950,7 @@
   lines =<< trim END
       s:notexist:repl
   END
-  v9.CheckDefAndScriptFailure(lines, ['E488: Trailing characters: :repl', 'E1268:'], 1)
+  v9.CheckDefAndScriptFailure(lines, ['E1101: Cannot declare a script variable in a function: s:notexist', "E1069: White space required after ':'"], 1)
 
   lines =<< trim END
       notexist:repl