Fix finding player network channel with Protocollib and Floodgate

This resolves the deleted ProtocolLib method for newer builds, but uses
reflection to find the channel despite the variable name.

Fixes #1216

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/ProtocolLibListener.java

@@ -304,7 +304,7 @@ private static Channel getChannel(Player player) {
         NettyChannelInjector injector = (NettyChannelInjector) Accessors.getMethodAccessorOrNull(
                         TemporaryPlayerFactory.class, "getInjectorFromPlayer", Player.class
                 ).invoke(null, player);
-        return injector.getWrappedChannel();
+        return FuzzyReflection.getFieldValue(injector, Channel.class, true);
     }
 
     /**