Instrument missing screen metrics (#5764)

* Instrument missing screen metrics

- Done

Riot/Modules/Rooms/RoomsViewController.m

@@ -42,7 +42,7 @@
 {
     [super finalizeInit];
     
-    self.screenTimer = [[AnalyticsScreenTimer alloc] initWithScreen:AnalyticsScreenRooms];
+    self.screenTracker = [[AnalyticsScreenTracker alloc] initWithScreen:AnalyticsScreenRooms];
     self.tableViewPaginationThrottler = [[MXThrottler alloc] initWithMinimumDelay:0.1];
 }