Handle DEBUG_SAMPLE_SUBSCRIPTION structure change in 1.21.9 ->1.21.7 (#1111)

Author: FlorianMichael

common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_9to1_21_7/Protocol1_21_9To1_21_7.java

@@ -185,12 +185,19 @@ protected void registerPackets() {
             }
         });
 
+        registerServerbound(ServerboundPackets1_21_6.DEBUG_SAMPLE_SUBSCRIPTION, wrapper -> {
+            final int sampleType = wrapper.read(Types.VAR_INT);
+            if (sampleType == 0) { // TICK_TIME
+                wrapper.write(Types.VAR_INT, 1); // Subscription count
+                wrapper.write(Types.VAR_INT, 0); // Subscription registry id (DEDICATED_SERVER_TICK_TIME)
+            }
+        });
+
         cancelClientbound(ClientboundPackets1_21_9.DEBUG_BLOCK_VALUE);
         cancelClientbound(ClientboundPackets1_21_9.DEBUG_CHUNK_VALUE);
         cancelClientbound(ClientboundPackets1_21_9.DEBUG_ENTITY_VALUE);
         cancelClientbound(ClientboundPackets1_21_9.DEBUG_EVENT);
         cancelClientbound(ClientboundPackets1_21_9.GAME_EVENT_TEST_HIGHLIGHT_POS);
-        cancelServerbound(ServerboundPackets1_21_6.DEBUG_SAMPLE_SUBSCRIPTION);
     }
 
     @Override