patch 8.2.0707: Vim9 function test fails

Problem:    Vim9 function test fails.
Solution:   Adjust expected error code.
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 83cef67..ab5f9ec 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -656,7 +656,7 @@
 def Test_unknown_function()
   CheckDefExecFailure([
       'let Ref: func = function("NotExist")',
-      'delfunc g:NotExist'], 'E700:')
+      'delfunc g:NotExist'], 'E130:')
 enddef
 
 def RefFunc(Ref: func(string): string): string