Moves analytics event for feedback to the library.

modules/UI/Feedback.js

                             = document.getElementById("feedbackTextArea").value;
 
                         if (feedbackDetails && feedbackDetails.length > 0) {
-                            JitsiMeetJS.analytics.sendEvent(
-                                'feedback.rating', Feedback.feedbackScore);
                             APP.conference.sendFeedback( Feedback.feedbackScore,
                                                     feedbackDetails);
                         }