style: remove unused variables and unused import

cubicweb/web/test/unittest_views_basecontrollers.py

@@ -113,8 +113,8 @@ class EditControllerTC(CubicWebTC):
                 0
             ]
 
-        with self.admin_access.web_request() as req2:
-            form2 = self.vreg["views"].select("edition", req, rset=e.as_rset(), row=0)
+        with self.admin_access.web_request():
+            self.vreg["views"].select("edition", req, rset=e.as_rset(), row=0)
 
         with self.admin_access.web_request(**dict(html_form.form_values())) as req:
             path, args = self.expect_redirect_handle_request(req, path="edit")