Instrument missing screen metrics (#5764)

* Instrument missing screen metrics

- Done

Riot/Modules/Common/Recents/RecentsViewController.m

@@ -264,6 +264,8 @@ NSString *const RecentsViewControllerDataReadyNotification = @"RecentsViewContro
 - (void)viewWillAppear:(BOOL)animated
 {
     [super viewWillAppear:animated];
+    
+    [self.screenTracker trackScreen];
 
     // Reset back user interactions
     self.userInteractionEnabled = YES;
@@ -334,14 +336,6 @@ NSString *const RecentsViewControllerDataReadyNotification = @"RecentsViewContro
         // the selected room (if any) is highlighted.
         [self refreshCurrentSelectedCell:YES];
     }
-    
-    [self.screenTimer start];
-}
-
-- (void)viewDidDisappear:(BOOL)animated
-{
-    [super viewDidDisappear:animated];
-    [self.screenTimer stop];
 }
 
 - (void)viewDidLayoutSubviews