fix: [base] target debian ``9.13`` as well as ``9`` when installing ``fzf``

precise/base-0k/hooks/install.d/30-customize.sh

@@ -41,7 +41,7 @@ if ! type -p fzf; then
     case $(lsb_release -is) in
         Debian)
             case $(lsb_release -rs) in
-                9)
+                9|9.*)
                     backports_list="/etc/apt/sources.list.d/backports.list"
                     if ! [ -e "$backports_list" ]; then
                         echo "deb http://ftp.debian.org/debian stretch-backports main" > \