(fix) prioritized channel data symbol over pair in trade msg handler

Author: vigan-abd

lib/transports/ws2.js

@@ -848,10 +848,10 @@ class WSv2 extends EventEmitter {
         : PublicTrade.unserialize(payload)
 
     const internalMessage = [chanData.chanId, eventName, data]
-    internalMessage.filterOverride = [chanData.pair || chanData.symbol]
+    internalMessage.filterOverride = [chanData.symbol || chanData.pair]
 
     this._propagateMessageToListeners(internalMessage, chanData, false)
-    this.emit('trades', chanData.pair || chanData.symbol, data)
+    this.emit('trades', chanData.symbol || chanData.pair, data)
   }
 
   /**