Add 'add participant' title.

Signed-off-by: Ivan Sein <ivan@nextcloud.com>

VideoCalls/AddParticipantsTableViewController.m

@@ -69,6 +69,9 @@
     UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                                                                   target:self action:@selector(cancelButtonPressed)];
     self.navigationController.navigationBar.topItem.leftBarButtonItem = cancelButton;
+    self.navigationItem.title = @"Add participants";
+    [self.navigationController.navigationBar setTitleTextAttributes:
+     @{NSForegroundColorAttributeName:[UIColor whiteColor]}];
     self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
     
     self.navigationController.navigationBar.translucent = NO;