Use correct gamemode type in respawn packet

core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_15_2to1_16/packets/EntityPackets1_16.java

@@ -55,7 +55,7 @@ public class EntityPackets1_16 extends EntityRewriter<Protocol1_15_2To1_16> {
             public void registerMap() {
                 map(dimensionTransformer);
                 map(Type.LONG);
-                map(Type.BYTE);
+                map(Type.UNSIGNED_BYTE);
                 handler(wrapper -> {
                     ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
                     clientWorld.setEnvironment(wrapper.get(Type.INT, 0));