patch 8.2.1207: Vim9: crash in expr test when run in the GUI

Problem:    Vim9: crash in expr test when run in the GUI.
Solution:   Break out of loop over hashtab also when function got removed and
            added.
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 020a752..dc95144 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1563,10 +1563,8 @@
 enddef
 
 func Test_expr7_trailing_fails()
-  " Temporarily commented out - somehow crash occurs with too many
-  " CheckDefFailure calls in the GUI only.
-  " call CheckDefFailure(['let l = [2]', 'l->{l -> add(l, 8)}'], 'E107')
-  " call CheckDefFailure(['let l = [2]', 'l->{l -> add(l, 8)} ()'], 'E274')
+  call CheckDefFailure(['let l = [2]', 'l->{l -> add(l, 8)}'], 'E107')
+  call CheckDefFailure(['let l = [2]', 'l->{l -> add(l, 8)} ()'], 'E274')
 endfunc
 
 func Test_expr_fails()