UI: Clean up AXAML code

* Remove unused namespaces
* Remove redundant attached property setters
* Use IsCheckedChanged in lieu of the obsolete Checked
* Optimize row & column definitions

src/Ryujinx/UI/Controls/ApplicationGridView.axaml

@@ -2,7 +2,6 @@
     x:Class="Ryujinx.Ava.UI.Controls.ApplicationGridView"
     xmlns="https://github.com/avaloniaui"
     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:helpers="clr-namespace:Ryujinx.Ava.UI.Helpers"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
@@ -16,10 +15,7 @@
     <UserControl.Resources>
         <helpers:BitmapArrayValueConverter x:Key="ByteImage" />
     </UserControl.Resources>
-    <Grid>
-        <Grid.RowDefinitions>
-            <RowDefinition Height="*" />
-        </Grid.RowDefinitions>
+    <Grid RowDefinitions="*">
         <ListBox
             Grid.Row="0"
             Padding="8"
@@ -59,11 +55,7 @@
                             Classes.small="{Binding $parent[UserControl].((viewModels:MainWindowViewModel)DataContext).IsGridSmall}"
                             ClipToBounds="True"
                             CornerRadius="4">
-                            <Grid>
-                                <Grid.RowDefinitions>
-                                    <RowDefinition Height="Auto" />
-                                    <RowDefinition Height="Auto" />
-                                </Grid.RowDefinitions>
+                            <Grid RowDefinitions="Auto,Auto">
                                 <Image
                                     Grid.Row="0"
                                     HorizontalAlignment="Stretch"