Remove obsolete quarter-backdrop.jpg from app cache creation.
Remove obsolete quarter-backdrop.jpg from app cache creation.

manesiotise/dreamwriter,zztczcx/dreamwriter,Softsapiens/dreamwriter,ajnsit/dreamwriter,ajnsit/dreamwriter,makyo/dreamwriter,rtfeldman/dreamwriter,manesiotise/dreamwriter,Iced-Tea/dreamwriter,jlongster/dreamwriter,jlongster/dreamwriter,Iced-Tea/dreamwriter,rtfeldman/dreamwriter,zztczcx/dreamwriter,makyo/dreamwriter,Softsapiens/dreamwriter