formatter: fix mediaelement video view
formatter: fix mediaelement video view

* NOTE Detailed record page needs javascript in the <head> tag.
  (closes #1999)

Signed-off-by: Jiri Kuncar <2bdffcb416fed3002465740d19a053a39918cbe5@cern.ch>

inveniosoftware/invenio-records,inveniosoftware/invenio-records,tiborsimko/invenio-records,tiborsimko/invenio-records