SPIGOT-7639: Incoming plugin channels not working

By: md_5 <git@md-5.net>

paper-server/nms-patches/net/minecraft/server/network/PlayerConnection.patch

@@ -1722,3 +1722,16 @@
          }
      }
  
+@@ -1933,8 +3022,10 @@
+         });
+     }
+ 
+-    @Override
+-    public void handleCustomPayload(ServerboundCustomPayloadPacket serverboundcustompayloadpacket) {}
++    // CraftBukkit start - handled in super
++    // @Override
++    // public void handleCustomPayload(ServerboundCustomPayloadPacket serverboundcustompayloadpacket) {}
++    // CraftBukkit end
+ 
+     @Override
+     public EntityPlayer getPlayer() {