Changed check for SteamOS

Ani-Cli originally checks for Steam Deck / SteamOS by checking for the default hostname, which breaks the script if the hostname is changed by the user.
This fix checks for the kernel codename instead.

ani-cli

@@ -324,7 +324,7 @@ quality="${ANI_CLI_QUALITY:-best}"
 case "$(uname -a)" in
     *Darwin*) player_function="${ANI_CLI_PLAYER:-iina}" ;;            # mac OS
     *ndroid*) player_function="${ANI_CLI_PLAYER:-android_mpv}" ;;     # Android OS (termux)
-    *steamdeck*) player_function="${ANI_CLI_PLAYER:-flatpak_mpv}" ;;  # steamdeck OS
+    *neptune*) player_function="${ANI_CLI_PLAYER:-flatpak_mpv}" ;;  # steamdeck OS - Fixed checking for default hostname, now checks for kernel codename.
     *MINGW* | *WSL2*) player_function="${ANI_CLI_PLAYER:-mpv.exe}" ;; # Windows OS
     *ish*) player_function="${ANI_CLI_PLAYER:-iSH}" ;;                # iOS (iSH)
     *) player_function="${ANI_CLI_PLAYER:-mpv}" ;;                    # Linux OS