Lua/LuaCoroutine: Fixed movement assignation operator

ChangeLog.md

@@ -156,6 +156,7 @@ Nazara Engine:
 - ⚠ **Changed the way resources were Loaded, almost every LoadFromX and OpenFromX methods are now static and create the object themselves.**
 - ⚠ SoundStream is now responsible for loaders instead of Music, and is now threadsafe (you can now load a stream only once and play it multiple times at the same time)
 - Added LuaState::RawEqual
+- Fixed LuaCoroutine movement assignation operator
 
 Nazara Development Kit:
 - Added ImageWidget (#139)

include/Nazara/Lua/LuaCoroutine.inl

@@ -15,8 +15,7 @@ namespace Nz
 	{
 		LuaState::operator=(std::move(instance));
 
-		m_ref = instance.m_ref;
-		instance.m_ref = -1;
+		std::swap(m_ref, instance.m_ref);
 
 		return *this;
 	}