libobs: Fix Windows 10/11 Gamemode/HAGS detection

It seems that the older key still exists on Win 11 and 10 but is always
set to 0, so use the newer to start with and fall back to the old one if
necessary.

Additionally, if the key for HAGS and GameMode do not exist assume
they're on as this is the default on Win 11. On Windows 10 game mode is
also on by default in recent versions.

Also changes "10" to "10/11" just for correctness.
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f