wsclient: set ua on ws request

The network interceptor appears to not work for websocket requests, and so uses the default user agent

runelite-client/src/main/java/net/runelite/client/ws/WSClient.java

@@ -102,6 +102,7 @@ public class WSClient extends WebSocketListener implements AutoCloseable
 
 		Request request = new Request.Builder()
 			.url(RuneLiteAPI.getWsEndpoint())
+			.header("User-Agent", RuneLiteAPI.userAgent)
 			.build();
 
 		webSocket = okHttpClient.newWebSocket(request, this);