Order the roomEvents models from newest to oldest

Qt somehow handles scrolling on new messages on its own when the
ListView direction is bottom to top.
In normal top to bottom, manual scrolling is completly buggy.

harmonyqml/components/side_pane/utils.js

@@ -4,7 +4,7 @@
 function get_last_room_event_text(room_id) {
     var eventsModel = Backend.models.roomEvents.get(room_id)
 
-    for (var i = -1; i >= -eventsModel.count; i--) {
+    for (var i = 0; i < eventsModel.count; i++) {
         var ev = eventsModel.get(i)
 
         if (ev.type !== "RoomMemberEvent") {