Fix styling for Admin Menu lists (#38261)

* remove styleclass from playertab 'button' lines

* cvar, fix button-style header alignment

* Fix requested changes

And also the extra cvar things I was meant to remove in the upstream merge

* Tiny tweaks

---------

Co-authored-by: Errant <35878406+Errant-4@users.noreply.github.com>

Content.Client/Administration/UI/Tabs/ObjectsTab/ObjectsTab.xaml.cs

@@ -132,8 +132,8 @@ public sealed partial class ObjectsTab : Control
         entry.OnTeleport += TeleportTo;
         entry.OnDelete += Delete;
         button.ToolTip = $"{info.Name}, {info.Entity}";
-
         button.AddChild(entry);
+        button.StyleClasses.Clear();
     }
 
     private bool DataFilterCondition(string filter, ListData listData)

Content.Client/Administration/UI/Tabs/PlayerTab/PlayerTab.xaml.cs

@@ -172,6 +172,7 @@ public sealed partial class PlayerTab : Control
             _playerTabSymbolSetting);
         button.AddChild(entry);
         button.ToolTip = $"{player.Username}, {player.CharacterName}, {player.IdentityName}, {player.StartingJob}";
+        button.StyleClasses.Clear();
     }
 
     /// <summary>