Make layerview panel hug the bottom of small windows
Make layerview panel hug the bottom of small windows

Fixes https://github.com/Ultimaker/Cura/issues/2013

fieldOfView/Cura,fieldOfView/Cura,Curahelper/Cura,ynotstartups/Wanhao,Curahelper/Cura,ynotstartups/Wanhao