Replace last unique line in meta binary template

src/bin/satcmd.skel

 SATURNIN_APP_VERSION="__MKIT_PROJ_VERSION__"
 SATURNIN_CACHE_HOME="__SATURNIN_CACHE_HOME__"
 SATURNIN_LIBEXEC="__SATURNIN_LIBEXEC__"
-SATURNIN_LIBEXEC_PREFIX="satcmd-"
+SATURNIN_LIBEXEC_PREFIX="__MKIT_PROJ_PKGNAME__-"
 SHELLFU_PATH="__SATURNIN_SHELLFU_DIR__"
 SHELLFU_PRETTY_USAGE="subcommand"