Hamburger button state is now correct (no more double clicks) but it's a bit hacky

Changed Help tooltip location in New Database Settings page
Suggest Save As when opening DB when another is opened and there is a save error

ModernKeePass/Views/MainPageFrames/ImportExportPage.xaml.cs

@@ -1,8 +1,4 @@
-using System;
-using Windows.Storage.Pickers;
-using Windows.UI.Xaml;
-
-// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
 
 namespace ModernKeePass.Views
 {
@@ -15,21 +11,5 @@ namespace ModernKeePass.Views
         {
             InitializeComponent();
         }
-
-        private async void ImportFileButton_OnClick(object sender, RoutedEventArgs e)
-        {
-            var picker =
-                new FileOpenPicker
-                {
-                    ViewMode = PickerViewMode.List,
-                    SuggestedStartLocation = PickerLocationId.DocumentsLibrary
-                };
-            picker.FileTypeFilter.Add(".csv");
-
-            // Application now has read/write access to the picked file
-            var file = await picker.PickSingleFileAsync().AsTask();
-            if (file == null) return;
-            
-        }
     }
 }