Modernize sources list for containerized package manager

installJRMC

@@ -445,7 +445,7 @@ get_latest_mc_version() {
 		EOF
     apt update --allow-insecure-repositories &>/dev/null' &&
   MC_VERSION=$(buildah run "$cnt" -- apt-cache policy mediacenter?? | grep Candidate | awk '{print $2}' | sort -V | tail -n1) &>/dev/null &&
-  [[ $MC_VERSION =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+  [[ $MC_VERSION =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
     mc_version_source="containerized package manager"
     execute buildah rm "$cnt"
   # Fallback to webscrape