New HHVBF_UFO restrict files for switching to the 5 flavour scheme

It was decided that the new run-3 non-resonant HH VBF samples should be produced in the 5 flavour scheme (FS) (in comparison to the run-2 samples which were produced in the 4 FS). For that new restrict files of the HHVBF UFO model are needed. The added restrict files do this job by setting the quark masses except for the top quark mass to 0. The Yukawa coupling in the restrict files was kept at the default value which was decided after discussion with the PMG weak conveners.