Tidy up ExpandrecurringBillingEventsAction

Per nickfelt's suggestion on []
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=127193451

javatests/google/registry/flows/host/HostInfoFlowTest.java

@@ -163,8 +163,4 @@ public class HostInfoFlowTest extends ResourceFlowTestCase<HostInfoFlow, HostRes
     persistHostResource(false);
     runFlow();
   }
-
-  // Extra methods so the test runner doesn't produce empty shards.
-
-  @Test public void testNothing1() {}
 }