Cleanup - Use RemoveAllChildren() over DisposeAllChildren() (#39848)

* Content - change the (should-be-obsolete) DisposeAllChildren into the more robust RemoveAllChildren.

* Remove duplicate calls.

---------

Co-authored-by: ElectroJr <leonsfriedrich@gmail.com>

Content.Client/Shuttles/UI/EmergencyConsoleWindow.xaml.cs

@@ -59,7 +59,7 @@ public sealed partial class EmergencyConsoleWindow : FancyWindow,
         // TODO: Loc and cvar for this.
         _earlyLaunchTime = scc.EarlyLaunchTime;
 
-        AuthorizationsContainer.DisposeAllChildren();
+        AuthorizationsContainer.RemoveAllChildren();
         var remainingAuths = scc.AuthorizationsRequired - scc.Authorizations.Count;
         AuthorizationCount.Text = Loc.GetString("emergency-shuttle-ui-remaining", ("remaining", remainingAuths));