patch 9.0.1809: termdebug test flayk

Problem:  termdebug test flayk
Solution: wait slightly longer

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_termdebug.vim b/src/testdir/test_termdebug.vim
index 49c84cf..561dd47 100644
--- a/src/testdir/test_termdebug.vim
+++ b/src/testdir/test_termdebug.vim
@@ -61,7 +61,7 @@
         \  'priority': 110, 'group': 'TermDebug'}],
         \ sign_getplaced('', #{group: 'TermDebug'})[0].signs)
   Run
-  call term_wait(gdb_buf, 200)
+  call term_wait(gdb_buf, 400)
   redraw!
   call assert_equal([
         \ {'lnum': 9, 'id': 12, 'name': 'debugPC', 'priority': 110,