Small UI Fixes for subscriptions (#2690)

Task/Issue URL: https://app.asana.com/0/1204099484721401/1207003662391345/f

Description:
A few minor UI changes.
- Added a title to the VPN navigation bar
- Added a loader to Restore View

DuckDuckGo/NetworkProtectionRootViewController.swift

@@ -32,6 +32,7 @@ final class NetworkProtectionRootViewController: UIHostingController<NetworkProt
     override func viewDidLoad() {
         super.viewDidLoad()
         decorate()
+        self.title = UserText.netPNavTitle
     }
 
     @MainActor required dynamic init?(coder aDecoder: NSCoder) {

DuckDuckGo/Subscription/ViewModel/SubscriptionRestoreViewModel.swift

@@ -107,11 +107,8 @@ final class SubscriptionRestoreViewModel: ObservableObject {
                     self.state.viewTitle = UserText.subscriptionAddDeviceTitle
                 }
             default:
-                state.isLoading = false
-            }
-        } else {
-            DispatchQueue.main.async {
                 self.state.viewTitle = UserText.subscriptionActivate
+                state.isLoading = false
             }
         }
     }

DuckDuckGo/Subscription/Views/SubscriptionRestoreView.swift

@@ -217,6 +217,8 @@ struct SubscriptionRestoreView: View {
                         }
                     }
                 }
+            } else {
+                SwiftUI.ProgressView()
             }
         }
     }