changes to locking of the database: implement an alternative to alarm-based timeout (using a timeout variables checked when resuming), closes https://github.com/PhilippC/keepass2android/issues/1346

src/Kp2aBusinessLogic/database/edit/DeleteRunnable.cs

@@ -234,7 +234,7 @@ namespace keepass2android
 				else
 				{
 					// Let's not bother recovering from a failure to save.  It is too much work.
-					App.Lock(false);
+					App.Lock(false, false);
 				}
 			}, OnFinishToRun);
 

src/Kp2aBusinessLogic/database/edit/EditGroup.cs

@@ -82,7 +82,7 @@ namespace keepass2android
 					_editGroup.App.DirtyGroups.Add(_editGroup.Group.ParentGroup);
 				} else
 				{
-					_editGroup._app.Lock(false);
+					_editGroup._app.Lock(false, false);
 				}
 				
 				base.Run();