Revert "update wcs tests (#10564)"

This reverts commit d4033ffcd8.

tests/test_wcs.py

@@ -252,10 +252,8 @@ def test_current_forms_cell_setup():
     cell = WcsCurrentFormsCell()
     form_class = cell.get_default_form_class()
     form = form_class()
-    choices = form.fields['wcs_site'].widget.choices
-    assert ('', 'All') in choices
-    assert (u'default', u'test') in choices
-    assert (u'other', u'test2') in choices
+    assert form.fields['wcs_site'].widget.choices == [
+            ('', 'All'), (u'default', u'test'), (u'other', u'test2')]
 
     try:
         # check there is not wcs_site field if there's a single one defined in