TriggerTest: Use TriggerValidation MC prescale set for all full-menu MC tests

...alidation/TriggerTest/test/test_trig_mc_v1Dev_MT_build.py

...igValidation/TriggerTest/test/test_trig_mc_v1Dev_build.py

...idation/TriggerTest/test/test_trig_mc_v1Dev_deps_build.py

...rigValidation/TriggerTest/test/test_trig_mc_v1Dev_grid.py

...idation/TriggerTest/test/test_trig_mc_v1Dev_pu80_build.py

...lidation/TriggerTest/test/test_trig_mc_v1Dev_pu80_grid.py

...tion/TriggerTest/test/test_trig_mc_v1Dev_writeBS_build.py

...ation/TriggerTest/test/test_trig_mc_v1Dev_writeBS_grid.py