Changed some observable collections types for HamburgerMenu binding (issue with WinRT 8.1)

Restored CollectionViewSource for recent (issue with WinRT 8.1)
Forbid horizontal scrolling in Main Menu
Fixed an incorrect SetupFocusAction target object binding

ModernKeePass/Views/MainPageFrames/RecentDatabasesPage.xaml

@@ -9,6 +9,11 @@
     mc:Ignorable="d"
     DataContext="{Binding Source={StaticResource Locator}, Path=Recent}">
     <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.Resources>
+            <CollectionViewSource 
+            x:Name="RecentItemsSource" 
+            Source="{Binding RecentItems}" />
+        </Grid.Resources>
         <Grid.RowDefinitions>
             <RowDefinition Height="40" />
             <RowDefinition Height="*" />
@@ -21,7 +26,7 @@
         </HyperlinkButton>
         <controls:SelectableTemplateListView Grid.Row="1"
             SelectedIndex="{Binding SelectedIndex}"
-            ItemsSource="{Binding RecentItems}"
+            ItemsSource="{Binding Source={StaticResource RecentItemsSource}}"
             ItemContainerStyle="{StaticResource ListViewLeftIndicatorItemExpanded}">
             <controls:SelectableTemplateListView.SelectedItemTemplate>
                 <DataTemplate>