base: bundle less filename correction
base: bundle less filename correction

* Corrects the less JS bundle filename to avoid causing a file
  not found error for this file while building assets.

Signed-off-by: Jan Aage Lavik <8d55e006a1b29770f275a5c59a7341f17f8e69d5@cern.ch>

tiborsimko/invenio-base,inveniosoftware/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base