testXHTML: ignore gadget_vcs_status.js from erp5_forge

jsl complains about "class" in object literals, but there's nothing wrong
with this.

portal_skins/erp5_vcs/gadget_vcs_status.js
(17): SyntaxError: invalid property id
      class: true,

product/ERP5/tests/testXHTML.py

@@ -79,6 +79,7 @@ class TestXHTMLMixin(ERP5TypeTestCase):
         'require.min.js',
         'rsvp.js',
         'wz_dragdrop.js',
+        'gadget_vcs_status.js',  # XXX because jsl is buggy
         )
   JSL_IGNORE_SKIN_LIST = (
         'erp5_code_mirror',