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/Lobby/UI/HumanoidProfileEditor.xaml.cs

@@ -491,7 +491,7 @@ namespace Content.Client.Lobby.UI
         /// </summary>
         public void RefreshTraits()
         {
-            TraitsList.DisposeAllChildren();
+            TraitsList.RemoveAllChildren();
 
             var traits = _prototypeManager.EnumeratePrototypes<TraitPrototype>().OrderBy(t => Loc.GetString(t.Name)).ToList();
             TabContainer.SetTabTitle(3, Loc.GetString("humanoid-profile-editor-traits-tab"));
@@ -632,7 +632,7 @@ namespace Content.Client.Lobby.UI
 
         public void RefreshAntags()
         {
-            AntagList.DisposeAllChildren();
+            AntagList.RemoveAllChildren();
             var items = new[]
             {
                 ("humanoid-profile-editor-antag-preference-yes-button", 0),
@@ -826,7 +826,7 @@ namespace Content.Client.Lobby.UI
         /// </summary>
         public void RefreshJobs()
         {
-            JobList.DisposeAllChildren();
+            JobList.RemoveAllChildren();
             _jobCategories.Clear();
             _jobPriorities.Clear();
             var firstCategory = true;