Clean up hardcoded UI paths.

Assets/Cryville/Crtr/UI/Menu.cs

@@ -22,6 +22,8 @@ namespace Cryville.Crtr.UI {
 		TMP_Text m_title;
 		[SerializeField]
 		GameObject[] m_backBlockingObjects;
+		[SerializeField]
+		GameObject m_contents;
 #pragma warning restore IDE0044
 
 		int frameIndex = 2;
@@ -30,7 +32,7 @@ namespace Cryville.Crtr.UI {
 #pragma warning disable IDE0051
 		void Awake() {
 			Game.Init();
-			transform.parent.Find("Canvas/Contents").gameObject.SetActive(true);
+			m_contents.SetActive(true);
 			m_settingsPanel.Adapter = new DefaultPropertyMasterAdapter(Settings.Default);
 			PushTitle("Chart Browser");
 		}