Windows: Use App.HintContextChange() where applicable

Elwig/Windows/AreaComAdminWindow.xaml.cs

@@ -287,7 +287,7 @@ namespace Elwig.Windows {
             ShowAreaCommitmentNewEditDeleteButtons();
             LockInputs();
             UnlockSearchInputs();
-            await RefreshAreaCommitmentList();
+            await App.HintContextChange();
             AreaCommitmentList.SelectedItem = a;
         }