Instrument missing screen metrics (#5764)

* Instrument missing screen metrics

- Done

Riot/Modules/Settings/SettingsViewController.m

@@ -289,7 +289,7 @@ TableViewSectionsDelegate>
 @property (nonatomic) BOOL isPreparingIdentityService;
 @property (nonatomic, strong) ServiceTermsModalCoordinatorBridgePresenter *serviceTermsModalCoordinatorBridgePresenter;
 
-@property (nonatomic) AnalyticsScreenTimer *screenTimer;
+@property (nonatomic) AnalyticsScreenTracker *screenTracker;
 
 @end
 
@@ -324,7 +324,7 @@ TableViewSectionsDelegate>
     isResetPwdInProgress = NO;
     is3PIDBindingInProgress = NO;
     
-    self.screenTimer = [[AnalyticsScreenTimer alloc] initWithScreen:AnalyticsScreenSettings];
+    self.screenTracker = [[AnalyticsScreenTracker alloc] initWithScreen:AnalyticsScreenSettings];
 }
 
 - (void)updateSections
@@ -797,6 +797,8 @@ TableViewSectionsDelegate>
 {
     [super viewWillAppear:animated];
     
+    [self.screenTracker trackScreen];
+
     // Refresh display
     [self refreshSettings];
 
@@ -825,8 +827,6 @@ TableViewSectionsDelegate>
     [self releasePushedViewController];
     
     [self.settingsDiscoveryTableViewSection reload];
-    
-    [self.screenTimer start];
 }
 
 - (void)viewWillDisappear:(BOOL)animated
@@ -870,12 +870,6 @@ TableViewSectionsDelegate>
     }
 }
 
-- (void)viewDidDisappear:(BOOL)animated
-{
-    [super viewDidDisappear:animated];
-    [self.screenTimer stop];
-}
-
 #pragma mark - Internal methods
 
 - (void)pushViewController:(UIViewController*)viewController