patch 8.2.3404: Vim9: no error for white space before "("

Problem:    Vim9: no error for white space before "(".
Solution:   Give an error, like in a compiled function.
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index f0c4c0d..09f80e9 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -467,6 +467,10 @@
   MyVarargs('one', 'two', 'three')->assert_equal('one,two,three')
 enddef
 
+def Test_call_white_space()
+  CheckDefAndScriptFailure2(["call Test ('text')"], 'E476:', 'E1068:')
+enddef
+
 def MyDefaultArgs(name = 'string'): string
   return name
 enddef