Instrument missing screen metrics (#5764)

* Instrument missing screen metrics

- Done

Riot/Modules/Room/Members/RoomParticipantsViewController.m

@@ -251,6 +251,8 @@
     
     // Refresh display
     [self refreshTableView];
+    
+    [self.screenTracker trackScreen];
 }
 
 - (void)viewDidAppear:(BOOL)animated
@@ -268,8 +270,6 @@
         [contactsPickerViewController destroy];
         contactsPickerViewController = nil;
     }
-    
-    [self.screenTimer start];
 }
 
 - (void)viewWillDisappear:(BOOL)animated
@@ -286,12 +286,6 @@
     [self searchBarCancelButtonClicked:_searchBarView];
 }
 
-- (void)viewDidDisappear:(BOOL)animated
-{
-    [super viewDidDisappear:animated];
-    [self.screenTimer stop];
-}
-
 - (void)withdrawViewControllerAnimated:(BOOL)animated completion:(void (^)(void))completion
 {
     // Check whether the current view controller is displayed inside a segmented view controller in order to withdraw the right item