Fix test tag

This test requires all manila services running
and should be tagged as TAG_API_WITH_BACKEND.

Change-Id: I9c4e24c098dc510f3e9593a27c2ea22540da7a30
diff --git a/manila_tempest_tests/tests/api/test_rules_negative.py b/manila_tempest_tests/tests/api/test_rules_negative.py
index 63ffb91..eafc93d 100644
--- a/manila_tempest_tests/tests/api/test_rules_negative.py
+++ b/manila_tempest_tests/tests/api/test_rules_negative.py
@@ -429,7 +429,7 @@
         self.assertEqual('error', share_alt_updated['access_rules_status'])
 
     @decorators.idempotent_id('1a9f46f0-d4e1-40ac-8726-aedd0320d583')
-    @tc.attr(base.TAG_NEGATIVE, base.TAG_API)
+    @tc.attr(base.TAG_NEGATIVE, base.TAG_API_WITH_BACKEND)
     def test_can_apply_new_cephx_rules_when_one_is_in_error_state(self):
         # Create share on "primary" tenant
         share_primary = self.create_share()