Correct GA unsub info (#7676)

* fix(analytics): better GA category handling

* refactor(analytics): chained OR

* fix(analytics): prefer gaCategory

website/server/libs/api-v3/analyticsService.js

@@ -144,7 +144,7 @@ let _generateValueForGoogleAnalytics = (data) => {
 
 let _sendDataToGoogle = (eventType, data) => {
   let eventData = {
-    ec: data.category,
+    ec: data.gaCategory || data.category || 'behavior',
     ea: eventType,
   };