Serialize active profile immediately

Otherwise:

- Switch from former active profile A to B
- Connect to now active profile B
- Kill app
- Reopen app
- App shows connected to profile A

Because active profile was not saved immediately on switch.

Unnecessary now to also save it on background persist().

Passepartout/App/Views/OrganizerView+Scene.swift

@@ -84,7 +84,6 @@ extension OrganizerView {
         }
         
         private func persist() {
-            appManager.activeProfileId = profileManager.activeProfileId
             profileManager.persist()
         }
     }

Passepartout/App/Views/ProfileView+VPN.swift

@@ -28,6 +28,8 @@ import PassepartoutCore
 
 extension ProfileView {
     struct VPNSection: View {
+        @ObservedObject private var appManager: AppManager
+
         @ObservedObject private var profileManager: ProfileManager
 
         @ObservedObject private var providerManager: ProviderManager
@@ -51,6 +53,7 @@ extension ProfileView {
         }
         
         init(currentProfile: ObservableProfile, isLoaded: Bool) {
+            appManager = .shared
             profileManager = .shared
             providerManager = .shared
             vpnManager = .shared
@@ -109,6 +112,9 @@ extension ProfileView {
                 Button(L10n.Profile.Items.UseProfile.caption) {
                     withAnimation {
                         profileManager.activateCurrentProfile()
+
+                        // IMPORTANT: save immediately to keep in sync with VPN status
+                        appManager.activeProfileId = profileManager.activeProfileId
                     }
                     Task {
                         await vpnManager.disable()

PassepartoutCore/Sources/PassepartoutCore/Managers/AppManager.swift

@@ -153,6 +153,7 @@ extension AppManager: AppPreferences {
         }
         set {
             defaults.set(newValue?.uuidString, forKey: DefaultKey.activeProfileId.rawValue)
+            defaults.synchronize()
             objectWillChange.send()
         }
     }