Don't suppress setting offer data value if it matches the existing value

https://dev.doctormckay.com/topic/5314-offerdata-method-headache/

lib/classes/TradeOffer.js

@@ -127,11 +127,6 @@ TradeOffer.prototype.data = function(key, value) {
 			return;
 		}
 
-		// We're setting the value. Check if the value already exists and is set to this value.
-		if (this.data(key) === value) {
-			return; // Already set, nothing to do
-		}
-
 		// Make sure pollData has offerData set.
 		pollData.offerData = pollData.offerData || {};
 		pollData.offerData[this.id] = pollData.offerData[this.id] || {};