Cleanup proxy packet injector in Spigot too. FIXES 127

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -1113,6 +1113,8 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		// Remove packet handlers
 		if (packetInjector != null)
 			packetInjector.cleanupAll();
+		if (spigotInjector != null)
+			spigotInjector.cleanupAll();
 		
 		// Remove server handler
 		playerInjection.close();

ProtocolLib/src/main/java/com/comphenix/protocol/injector/spigot/SpigotPacketInjector.java

@@ -545,4 +545,13 @@ public class SpigotPacketInjector implements SpigotPacketListener {
 		else
 			throw new PlayerLoggedOutException("Player " + player + " has logged out");
 	}
+
+	/**
+	 * Invoked when the server is cleaning up.
+	 */
+	public void cleanupAll() {
+		if (proxyPacketInjector != null) {
+			proxyPacketInjector.cleanupAll();
+		}
+	}
 }