Fix custom mounts after switch to /run/live
9990-misc-helpers.sh was still looping over /live/rootfs/* rather than /run/live/rootfs/*, breaking custom mount points. Update it to follow changes from 0d878d3a (see #886328).
9990-misc-helpers.sh was still looping over /live/rootfs/* rather than /run/live/rootfs/*, breaking custom mount points. Update it to follow changes from 0d878d3a (see #886328).