* galaxy: restore left hand slicing in assignment
Fix 'ansible-galaxy role init --role-skeleton=role-skeleton' when the role skeleton
contains an ignored directory.
The issue was because the 'dirs' variable was changed to reference a different list,
but needs to be mutated instead to stop os.walk from traversing ignored directories.
Fixes: #71977
Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>
