added lock setting to persist settings page lock action between app restarts

src/App/App.cs

@@ -175,7 +175,7 @@ namespace Bit.App
             }
 
             // Are we forcing a lock? (i.e. clicking a button to lock the app manually, immediately)
-            if(!forceLock)
+            if(!forceLock && !_settings.GetValueOrDefault(Constants.SettingLocked, false))
             {
                 // Lock seconds tells if if they want to lock the app or not
                 var lockSeconds = _settings.GetValueOrDefault<int?>(Constants.SettingLockSeconds);

src/App/Constants.cs

@@ -6,6 +6,7 @@
         public const string SettingPinUnlockOn = "setting:pinUnlockOn";
         public const string SettingLockSeconds = "setting:lockSeconds";
         public const string SettingLastBackgroundedDate = "lastBackgroundedDate";
+        public const string SettingLocked = "locked";
 
         public const string PasswordGeneratorLength = "pwGenerator:length";
         public const string PasswordGeneratorUppercase = "pwGenerator:uppercase";

src/App/Pages/Settings/SettingsPage.cs

@@ -188,6 +188,7 @@ namespace Bit.App.Pages
 
         private void LockCell_Tapped(object sender, EventArgs e)
         {
+            _settings.AddOrUpdateValue(Constants.SettingLocked, true);
             MessagingCenter.Send(Application.Current, "Lock", true);
         }