(fix) don't splice symbol into ticker messages

Author: f3rno

lib/transports/ws2.js

@@ -750,8 +750,6 @@ class WSv2 extends EventEmitter {
     let data = getMessagePayload(msg)
 
     if (this._transform) {
-      msg[1].splice(0, 0, chanData.symbol)
-
       data = (chanData.symbol || '')[0] === 't'
         ? new TradingTicker(msg[1])
         : new FundingTicker(msg[1])