Fix Qt widgets on low resolution displays.
Fix Qt widgets on low resolution displays.

closes #9255

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