Default to multiple column mode if backend doesn't have appropriate seting

app/javascript/flavours/glitch/util/initial_state.js

@@ -28,6 +28,6 @@ export const version = getMeta('version');
 export const mascot = getMeta('mascot');
 export const isStaff = getMeta('is_staff');
 export const defaultContentType = getMeta('default_content_type');
-export const forceSingleColumn = !getMeta('advanced_layout');
+export const forceSingleColumn = getMeta('advanced_layout') === false;
 
 export default initialState;