Revert "Avoid rate limit in presence endpoint"

This reverts commit 7423299a7c,
which is no longer needed as of 8746108de5

tests/events/test_presence_router.py

@@ -266,9 +266,6 @@ class PresenceRouterTestCase(FederatingHomeserverTestCase):
         self.assertEqual(presence_update.state, "online")
         self.assertEqual(presence_update.status_msg, "boop")
 
-        # Advance time a sufficient amount to avoid rate limiting.
-        self.reactor.advance(30)
-
         # Have all three users send presence
         send_presence_update(
             self,

tests/module_api/test_api.py

@@ -995,9 +995,6 @@ def _test_sending_local_online_presence_to_local_user(
 
     # Now we check that we don't receive *offline* updates using ModuleApi.send_local_online_presence_to.
 
-    # Advance time a sufficient amount to avoid rate limiting.
-    test_case.reactor.advance(30)
-
     # Presence sender goes offline
     send_presence_update(
         test_case,