Removed unnecessary references in .xaml files.

App.xaml

@@ -1,17 +1,14 @@
 <Application x:Class="Orpheus.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:Orpheus"
              xmlns:ui="http://schemas.modernwpf.com/2019"
              StartupUri="MainWindow.xaml">
     <Application.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
                 <ui:ThemeResources />
                 <ui:XamlControlsResources />
-                <!-- Other merged dictionaries here -->
             </ResourceDictionary.MergedDictionaries>
-            <!-- Other app resources here -->
         </ResourceDictionary>
     </Application.Resources>
 </Application>

Windows/ThemeWindow.xaml

@@ -3,7 +3,6 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:local="clr-namespace:Orpheus"
         mc:Ignorable="d"
         Title="Select Theme" Height="200" Width="400" WindowStartupLocation="CenterScreen">
     <Grid Margin="10">