fix double declartion on Orbis

Minecraft.Client/Common/Leaderboards/LeaderboardManager.cpp

@@ -9,7 +9,7 @@ const wstring LeaderboardManager::filterNames[eNumFilterModes] =
 		L"Friends", L"MyScore", L"TopRank"
 	};
 
-#if !defined(_DURANGO) && !defined(_WINDOWS64) && !defined(_XBOX) // str1k3r - only needed for sony platforms.
+#if defined(__PSVITA__)// str1k3r - only needed for sony platforms.
 LeaderboardManager *LeaderboardManager::m_instance = NULL;
 #endif