benchmarks: allow regular runtests in devel mode
benchmarks: allow regular runtests in devel mode

The safety check preventing benchmarks from running in non optimized or
dbg modes was triggering for a check-inputs-only run of regular
run_tests.  This fixes that behavior.

ref #9834

SudiptaBiswas/moose,idaholab/moose,dschwen/moose,laagesen/moose,jessecarterMOOSE/moose,laagesen/moose,milljm/moose,milljm/moose,andrsd/moose,lindsayad/moose,idaholab/moose,lindsayad/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,YaqiWang/moose,sapitts/moose,bwspenc/moose,nuclear-wizard/moose,harterj/moose,nuclear-wizard/moose,lindsayad/moose,bwspenc/moose,idaholab/moose,andrsd/moose,milljm/moose,laagesen/moose,permcody/moose,sapitts/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,friedmud/moose,bwspenc/moose,permcody/moose,dschwen/moose,sapitts/moose,friedmud/moose,jessecarterMOOSE/moose,friedmud/moose,dschwen/moose,SudiptaBiswas/moose,permcody/moose,idaholab/moose,milljm/moose,bwspenc/moose,andrsd/moose,YaqiWang/moose,dschwen/moose,sapitts/moose,milljm/moose,sapitts/moose,friedmud/moose,nuclear-wizard/moose,laagesen/moose,harterj/moose,lindsayad/moose,harterj/moose,idaholab/moose,andrsd/moose,lindsayad/moose,YaqiWang/moose,dschwen/moose,permcody/moose,nuclear-wizard/moose,andrsd/moose,bwspenc/moose,harterj/moose,harterj/moose,YaqiWang/moose,jessecarterMOOSE/moose,laagesen/moose,SudiptaBiswas/moose