OpenXR - Use per game stereo separation file

Core/Config.cpp

@@ -1208,7 +1208,6 @@ static ConfigSetting vrSettings[] = {
 	ConfigSetting("VREnableStereo", &g_Config.bEnableStereo, false),
 	ConfigSetting("VRCanvasDistance", &g_Config.iCanvasDistance, 6),
 	ConfigSetting("VRFieldOfView", &g_Config.iFieldOfViewPercentage, 100),
-	ConfigSetting("VRStereoSeparation", &g_Config.iStereoSeparation, 10),
 
 	ConfigSetting(false),
 };