Drop [Feature: tag to make sure this tests runs on pre-submits

In v1.27 StatefulSetStartOrdinal became beta, which makes it on by
default, but we forgot to turn these tests on along with it. This makes
these tests run always.

test/e2e/apps/statefulset.go

@@ -1463,7 +1463,7 @@ var _ = SIGDescribe("StatefulSet", func() {
 		})
 	})
 
-	ginkgo.Describe("Scaling StatefulSetStartOrdinal [Feature:StatefulSetStartOrdinal]", func() {
+	ginkgo.Describe("Scaling StatefulSetStartOrdinal", func() {
 		ssName := "ss"
 		labels := map[string]string{
 			"foo": "bar",