[Settings] Removed muxc prefix (#20164)

* Removed prefix

Quick deletion. Quick run in VS gave no problems.

* Removed prefix

Quick deletion. Quick run in VS gave no problems.

* update for new files

* Remove using muxc includes

src/settings-ui/Settings.UI/Views/VideoConference.xaml

@@ -6,7 +6,6 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:controls="using:Microsoft.PowerToys.Settings.UI.Controls"
     xmlns:converters="using:CommunityToolkit.WinUI.UI.Converters" 
-    xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
     mc:Ignorable="d">
 
     <Page.Resources>
@@ -28,7 +27,7 @@
                         <ToggleSwitch IsOn="{Binding Mode=TwoWay, Path=IsEnabled}" x:Uid="ToggleSwitch"/>
                     </controls:Setting.ActionContent>
                 </controls:Setting>
-                <muxc:InfoBar
+                <InfoBar
                     Severity="Warning"
                     x:Uid="VideoConference_RunAsAdminRequired"
                     IsOpen="True"