Simple fix for responsiveWindow referenced in https://github.com/learningequality/kolibri/pull/1911#discussion_r129904946
Simple fix for responsiveWindow
referenced in https://github.com/learningequality/kolibri/pull/1911#discussion_r129904946

mrpau/kolibri,lyw07/kolibri,christianmemije/kolibri,lyw07/kolibri,MingDai/kolibri,learningequality/kolibri,jonboiser/kolibri,jonboiser/kolibri,christianmemije/kolibri,benjaoming/kolibri,DXCanas/kolibri,jonboiser/kolibri,MingDai/kolibri,mrpau/kolibri,lyw07/kolibri,DXCanas/kolibri,benjaoming/kolibri,lyw07/kolibri,christianmemije/kolibri,mrpau/kolibri,DXCanas/kolibri,mrpau/kolibri,jonboiser/kolibri,learningequality/kolibri,indirectlylit/kolibri,benjaoming/kolibri,learningequality/kolibri,MingDai/kolibri,indirectlylit/kolibri,DXCanas/kolibri,learningequality/kolibri,benjaoming/kolibri,MingDai/kolibri,indirectlylit/kolibri,christianmemije/kolibri,indirectlylit/kolibri