Fix ControlMob on already controlled mob (#3868)

Content.Server/Administration/AdminVerbSystem.cs

@@ -85,7 +85,6 @@ namespace Content.Server.Administration
                 // TODO VERB ICON control mob icon
                 verb.Act = () =>
                 {
-                    targetMind.Mind?.TransferTo(null);
                     player.ContentData()?.Mind?.TransferTo(args.Target, ghostCheckOverride: true);
                 };
                 args.Verbs.Add(verb);

Content.Server/Administration/Commands/ControlMob.cs

@@ -60,7 +60,6 @@ namespace Content.Server.Administration.Commands
 
             DebugTools.AssertNotNull(mind);
 
-            mindComponent.Mind?.TransferTo(null);
             mind!.TransferTo(target);
         }
     }

Content.Server/Mind/Mind.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using Content.Server.GameTicking;
 using Content.Server.Ghost.Components;
 using Content.Server.Mind.Components;
 using Content.Server.Objectives;
@@ -254,8 +255,7 @@ namespace Content.Server.Mind
                 }
                 else if (component.HasMind)
                 {
-                    // TODO: Kick them out, maybe?
-                    throw new ArgumentException("That entity already has a mind.", nameof(entity));
+                    EntitySystem.Get<GameTicker>().OnGhostAttempt(component.Mind!, false);
                 }
 
                 if (entity.TryGetComponent(out ActorComponent? actor))