MORE usings

Author: maddie480

Entities/MiniHeartDoorUnfixController.cs

@@ -7,6 +7,7 @@
 using MonoMod.RuntimeDetour;
 using System;
 using System.Reflection;
+using System.Linq;
 
 namespace Celeste.Mod.MaxHelpingHand.Entities {
     // This controller reverts this fix, and was made to fix a map from Etpio in FLCC: https://github.com/EverestAPI/CelesteCollabUtils2/pull/60