remove outdated ackhandler test case

internal/ackhandler/received_packet_tracker_test.go

@@ -313,15 +313,6 @@ var _ = Describe("Received Packet Tracker", func() {
 					Expect(ack.HasMissingRanges()).To(BeFalse())
 				})
 
-				// TODO: remove this test when dropping support for STOP_WAITINGs
-				It("handles a lower limit of 0", func() {
-					tracker.IgnoreBelow(0)
-					tracker.ReceivedPacket(1337, protocol.ECNNon, time.Now(), true)
-					ack := tracker.GetAckFrame(true)
-					Expect(ack).ToNot(BeNil())
-					Expect(ack.LargestAcked()).To(Equal(protocol.PacketNumber(1337)))
-				})
-
 				It("resets all counters needed for the ACK queueing decision when sending an ACK", func() {
 					tracker.ReceivedPacket(1, protocol.ECNNon, time.Now(), true)
 					tracker.ackAlarm = time.Now().Add(-time.Minute)