AppCoordinator: Remove unnecessary variable assignment

Sources/Coordinators/AppCoordinator.swift

@@ -49,8 +49,7 @@ class Services: NSObject {
     }
 
     @objc func start() {
-        let tabbarCoordinator = VLCTabBarCoordinator(tabBarController: tabBarController, services: services)
-        childCoordinators.append(tabbarCoordinator)
+        childCoordinators.append(VLCTabBarCoordinator(tabBarController: tabBarController, services: services))
     }
 }