refactor: improve steamcmd dependency check

The code in `check_deps.sh` has been refactored to improve the steamcmd dependency check. The condition for checking if the non-free repository is enabled in Debian has been updated to use a more accurate regular expression. This change ensures that the correct dependencies are required and improves the accuracy of the check.

lgsm/modules/check_deps.sh

@@ -252,7 +252,7 @@ fn_deps_detector() {
 	elif [ "${deptocheck}" == "steamcmd" ] && [ -z "${appid}" ]; then
 		array_deps_required=("${array_deps_required[@]/steamcmd/}")
 		steamcmdstatus=1
-	elif [ "${deptocheck}" == "steamcmd" ] && [ "${distroid}" == "debian" ] && ! grep -qE "^deb .*non-free" /etc/apt/sources.list; then
+	elif [ "${deptocheck}" == "steamcmd" ] && [ "${distroid}" == "debian" ] && ! grep -qE '[^deb]+non-free([^-]|$)' /etc/apt/sources.list; then
 		array_deps_required=("${array_deps_required[@]/steamcmd/}")
 		steamcmdstatus=1
 	# Java: Added for users using Oracle JRE to bypass check.