- fix bash path for Leap 15.x (where bash still is /bin/bash)

This was reported on the factory ML, and since it's an easy fix, I did this quick SR instead of recommending the bugzilla paperwork ;-)

Please also re-submit the updated package to Leap 15.2 - the current submission is blocked by the installcheck which (rightfully) complains that /usr/bin/bash doesn't exist in Leap 15.2