AppDbContext: Move all calls to App.HintContextChange() outside of any AppDbContext block

Elwig/App.xaml.cs

@@ -53,7 +53,7 @@ namespace Elwig {
         public static Dispatcher MainDispatcher { get; private set; }
         private DateTime LastChanged;
         private static DateTime CurrentLastWrite => File.GetLastWriteTime(Config.DatabaseFile);
-        private readonly DispatcherTimer ContextTimer = new() { Interval = TimeSpan.FromSeconds(5) };
+        private readonly DispatcherTimer ContextTimer = new() { Interval = TimeSpan.FromSeconds(2) };
 
         public App() : base() {
             Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);