NVIDIA: pin the rebuilt 3.16.31-3 packages; shorter README text

The release was rebuilt from steamify-gamescope-nvidia main (same version, new hashes).

README.md

@@ -30,16 +30,11 @@ Steam Machine.
      as OS Version (e.g. `steamos-3.9`), `steam-machine` as OS Codename and
      Steamify's version as OS Variant. The OS name stays CachyOS
      ([details](TECHNICAL.md#what-steams-system-settings-show)).
-   - **NVIDIA graphics cards** (GTX 16 / RTX 20 series or newer): stock gamescope shows a corrupted
-     picture on them (an open NVIDIA driver bug), so on an NVIDIA PC Steamify installs a **patched gamescope**
-     (GBM scan-out, from [steamify-gamescope-nvidia](https://github.com/theupriser/steamify-gamescope-nvidia))
-     and sets up the rest: the gaming session starts on the monitor's own resolution and refresh rate, with
-     Steam's interface at that size. It is the same conversion as everywhere else, with one extra step.
-     The newest patched build for your CPU is downloaded from GitHub (checked, with a built-in fallback if GitHub
-     can't be reached), and a newer one shows up as an **Update** in the menu. Tested on an RTX 5080 only
-     ([details](TECHNICAL.md#nvidia-graphics-cards)).
-     The old **Gaming on NVIDIA** option (Steam on the desktop) is gone: a PC that had it on is moved to the
-     conversion, and keeps starting Steam in Big Picture if that was on.
+   - **NVIDIA graphics cards** (GTX 16 / RTX 20 series or newer) get the same
+     conversion: Steamify installs a patched gamescope for them and starts
+     gaming mode at your monitor's own resolution and refresh rate. A newer
+     patched gamescope shows up as an **Update** in the menu. Tested on an RTX
+     5080 only ([details](TECHNICAL.md#nvidia-graphics-cards)).
 2. **SteamOS theme** - the Vapor look of SteamOS for the desktop, with
    **Add to Steam** in right-click menus
    ([details](TECHNICAL.md#steamos-desktop-look)).

lib/gamescope-nvidia.sh

@@ -23,10 +23,10 @@ GSN_RELEASES="${GSN_RELEASES:-https://github.com/theupriser/steamify-gamescope-n
 GSN_VERSION=3.16.31-3
 # One build per CPU level, like CachyOS's repositories: generic is the one every x86-64 PC can run.
 declare -A GSN_SHA256=(
-    [generic]=4c7995694d2726c356785d9aec12a11c98419b4d2e139617f03bb46c758ced56
-    [v3]=43c6928ca9fa67c063c4e1b993b686145e94e68de1bd46645782d3186779fa2d
-    [v4]=b6d4621e4b98d9aa5c600fe9a5a1cae164fef6bbf93d259fb8a6af666b098f9f
-    [znver4]=60f45da74a0b96d776219f6e6aa22c5d23e48b08233b3fa12b6c4d7aa6812dd9
+    [generic]=e9c7e4d8e1f2a909c25c7e090a86e610234103c6014e65882e84bffe088bafb2
+    [v3]=0a2e9408d8faea3b7c8dda8a4f8d01f7c7e77eea2374590a311856ee3feb559e
+    [v4]=550c08910617d6e770dfa8ebe742f11d04fa65e51dea8773ce419e1e0244572e
+    [znver4]=ec05ba1ba7e7cbde7c2dbee6959b30f89a96659cd4b7f675837ac425ea028d5f
 )
 # Where the ISO leaves a copy of the pinned package, for installs without GitHub.
 GSN_BACKUP_DIR="${GSN_BACKUP_DIR:-/usr/local/share/steamify/gamescope}"