Replace Flex Panels in favor of Wrap Panels for Avalonia (#6267)

* Switch from using Flex panel to a Wrap panel for Grid view. This allows keyboard navigation.

* Stop using Flex panel in favor of Avalonia Wrap Panel.

src/Ryujinx.Ava/UI/Controls/ApplicationGridView.axaml

@@ -4,7 +4,6 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="clr-namespace:Ryujinx.Ava.UI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:flex="clr-namespace:Avalonia.Flexbox;assembly=Avalonia.Flexbox"
     xmlns:helpers="clr-namespace:Ryujinx.Ava.UI.Helpers"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:ui="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
@@ -33,11 +32,10 @@
             SelectionChanged="GameList_SelectionChanged">
             <ListBox.ItemsPanel>
                 <ItemsPanelTemplate>
-                    <flex:FlexPanel
+                    <WrapPanel
                         HorizontalAlignment="Center"
-                        VerticalAlignment="Stretch"
-                        AlignContent="FlexStart"
-                        JustifyContent="FlexStart" />
+                        VerticalAlignment="Top"
+                        Orientation="Horizontal" />
                 </ItemsPanelTemplate>
             </ListBox.ItemsPanel>
             <ListBox.Styles>