Toggle Enabled rather than Visibility on focus changed
Toggle Enabled rather than Visibility on focus changed

- Issue MatterHackers/MCCentral#3139
Movement controls keyboard icon disappears on lose focus

larsbrubaker/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,mmoening/MatterControl,larsbrubaker/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,mmoening/MatterControl,jlewin/MatterControl,mmoening/MatterControl