Changed bFullScreenExclusive to bAllowFullScreenExclusive

There's no guarantee VK_FULL_SCREEN_EXCLUSIVE_ALLOWED_EXT will enter Fullscreen exclusive (FSE). Under the right conditions, the driver and/or DWM can grant FSE. Adding "allow" to the FSE setting should make this a bit clearer.

Core/Config.cpp

@@ -748,8 +748,8 @@ static const ConfigSetting graphicsSettings[] = {
 
 #ifndef MOBILE_DEVICE
 	ConfigSetting("FullScreen", SETTING(g_Config, bFullScreen), false, CfgFlag::DEFAULT),
+	ConfigSetting("FullScreenExclusive", SETTING(g_Config, bAllowFullScreenExclusive), false, CfgFlag::DEFAULT),
 	ConfigSetting("FullScreenMulti", SETTING(g_Config, bFullScreenMulti), false, CfgFlag::DEFAULT),
-	ConfigSetting("FullScreenExclusive", SETTING(g_Config, bFullScreenExclusive), false, CfgFlag::DEFAULT),
 #endif
 
 #if PPSSPP_PLATFORM(IOS)