remove websocket trap

app/controllers/Round.scala

@@ -43,7 +43,6 @@ object Round extends LilaController with TheftPrevention with RoundEventPerforme
       getInt("version"),
       get("sri"),
       get("tk"),
-      get("tr") | "-",
       ctx).unsafePerformIO
   }
 

app/round/Socket.scala

@@ -120,9 +120,7 @@ final class Socket(
     version: Option[Int],
     uid: Option[String],
     token: Option[String],
-    trap: String,
     ctx: Context): IO[SocketPromise] = {
-    if (trap != "a") println("[websocket] trap %s %s".format(fullId, ctx.toString))
     getPlayerPov(fullId) map { join(_, true, version, uid, token, ctx) }
   }
 

public/javascripts/big.js

@@ -571,7 +571,7 @@ $.widget("lichess.game", {
           options: {
             name: "game"
           },
-        params: { tk: "--tkph--", tr: "a"},
+        params: { tk: "--tkph--" },
         events: {
           ack: function() {
             clearTimeout(self.socketAckTimeout);