feat: stage 재시작 조건 적용을 위한 ChangeScene 메소드 수정

Gameton-06/Assets/Gameton/Scripts/Common/Main.cs

@@ -55,7 +55,7 @@ namespace TON
             if (isSceneChangeProgress)
                 return;
 
-            if (currentSceneType == sceneType)
+            if (currentSceneType == sceneType && currentSceneType != SceneType.Stage)
                 return;
 
             currentSceneType = sceneType;