Don't need sks repo

src/freedombone-image-customise

     git clone $TOXIC_REPO $rootdir/repos/toxic
     git clone $TURTL_REPO $rootdir/repos/turtl
     git clone $KANBOARD_REPO $rootdir/repos/kanboard
-    git clone $KEYSERVER_SKS_REPO $rootdir/repos/keyserver
     git clone $KEYSERVER_WEB_REPO $rootdir/repos/keyserverweb
     #git clone $WEKAN_REPO $rootdir/repos/wekan
     #git clone $FLOW_ROUTER_REPO $rootdir/repos/flowrouter