Use -t instead of main params for TLDs in nomulus count_domains command (#493)

* Use -t instead of main params for TLDs in nomulus count_domains command

This makes the command consistent with list_domains. I use both frequently and it
was annoying forgetting which one takes -t and which uses main parameters. Now
they both work the same way.

core/src/test/java/google/registry/tools/CountDomainsCommandTest.java

@@ -49,7 +49,7 @@ public class CountDomainsCommandTest extends CommandTestCase<CountDomainsCommand
         persistActiveDomain(String.format("test-%d.baz", i));
       }
     }
-    runCommand("foo");
+    runCommand("-t=foo");
     assertStdoutIs("foo,51\n");
   }
 
@@ -64,7 +64,7 @@ public class CountDomainsCommandTest extends CommandTestCase<CountDomainsCommand
       persistDeletedDomain(String.format("del-%d.foo", j), clock.nowUtc().minusYears(1));
     }
     persistActiveDomain("not-counted.qux");
-    runCommand("foo", "bar", "baz");
+    runCommand("--tlds=foo,bar,baz");
     assertStdoutIs("foo,29\nbar,0\nbaz,17\n");
   }
 }