Fix Activity Test to account for more queries.

(imported from commit f8fa6a1054b2248104e1a4941e9c45f6edd06269)

zerver/tests.py

@@ -403,7 +403,9 @@ class ActivityTest(AuthedTestCase):
             )
         with queries_captured() as queries:
             self.client.get('/activity')
-        self.assertEqual(len(queries), 2)
+
+        # We have 8 tabs, and one query per tab.
+        self.assertEqual(len(queries), 8)
 
 class PublicURLTest(TestCase):
     """