Remove "skip_because" decorator - Launchpad:1934252

Bug was fixed in the Designate code and
"test_create_blacklist_invalid_pattern" is now PASS

Change-Id: I7504b0e8e140be8d4dfd5c4291e928373bccc926
diff --git a/designate_tempest_plugin/tests/api/v2/test_blacklists.py b/designate_tempest_plugin/tests/api/v2/test_blacklists.py
index cd859af..ecb5ce5 100644
--- a/designate_tempest_plugin/tests/api/v2/test_blacklists.py
+++ b/designate_tempest_plugin/tests/api/v2/test_blacklists.py
@@ -66,7 +66,6 @@
                                         expected_allowed, False)
 
     @decorators.idempotent_id('ea608152-da3c-11eb-b8b8-74e5f9e2a801')
-    @decorators.skip_because(bug="1934252")
     def test_create_blacklist_invalid_pattern(self):
         patterns = ['', '#(*&^%$%$#@$', 'a' * 1000]
         for pattern in patterns: