patch 8.2.1504: Vim9: white space checks are only done for a :def function

Problem:    Vim9: white space checks are only done for a :def function.
Solution:   Also do checks at the script level.  Adjust the name of a few
            error messages.
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 911f4ea..d9e823a 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -2336,7 +2336,8 @@
   call CheckDefFailure(["let x = '1'isnot2"], 'E488:', 1)
 
   call CheckDefFailure(["CallMe ('yes')"], 'E476:', 1)
-  call CheckDefFailure(["CallMe2('yes','no')"], 'E1069:', 1)
+  call CheckScriptFailure(["CallMe ('yes')"], 'E492:', 1)
+  call CheckScriptAndDefFailure(["CallMe2('yes','no')"], 'E1069:', 1)
   call CheckDefFailure(["CallMe2('yes' , 'no')"], 'E1068:', 1)
 
   call CheckDefFailure(["v:nosuch += 3"], 'E1001:', 1)
diff --git a/src/testdir/vim9.vim b/src/testdir/vim9.vim
index 823a6ca..2f92cf9 100644
--- a/src/testdir/vim9.vim
+++ b/src/testdir/vim9.vim
@@ -40,3 +40,10 @@
   so Xdef
   delete('Xdef')
 enddef
+
+" Check that a command fails both when used in a :def function and when used
+" in Vim9 script.
+def CheckScriptAndDefFailure(lines: list<string>, error: string, lnum = -3)
+  CheckDefFailure(lines, error, lnum)
+  CheckScriptFailure(['vim9script'] + lines, error, lnum + 1)
+enddef