Fix level editor child window size
Fix level editor child window size

Makes it slightly larger at 1280x640, which is our target screen size
for slightly smaller than chromebook screens.

icodegame/codecombat,kidaa/codecombat,codecombat/codecombat,javatlacati/codecombat,Zerrien/codecombat,kidaa/codecombat,jeremyprice/codecombat,javatlacati/codecombat,Zerrien/codecombat,VilkkuV/codecombat,kidaa/codecombat,jeremiahyan/codecombat,kidaa/codecombat,jeremiahyan/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,fabichoi/codecombat,Zerrien/codecombat,icodegame/codecombat,jeremiahyan/codecombat,Zerrien/codecombat,javatlacati/codecombat,probil/codecombat,codecombat/codecombat,probil/codecombat,jeremyprice/codecombat,jeremyprice/codecombat,VilkkuV/codecombat,VilkkuV/codecombat,icodegame/codecombat,VilkkuV/codecombat,icodegame/codecombat,fabichoi/codecombat,javatlacati/codecombat,fabichoi/codecombat,probil/codecombat,codecombat/codecombat,codecombat/codecombat,fabichoi/codecombat,jeremyprice/codecombat,probil/codecombat,codecombat/codecombat