QRandom: drop a usage of std::is_literal_type
It's deprecated/removed, and indeed doesn't check anything that it's not also already being checked by the previous line.
Change-Id: Ic80ca43f390dd989ced69f196efa7313069e7c6d Pick-to: 5.15 6.0 6.1 Reviewed-by: Thiago Macieira thiago.macieira@intel.com (cherry picked from commit 6351b543)