Fix #1528, remove reference to bgtexture.png, a file that was removed in #1512
Fix #1528, remove reference to bgtexture.png, a file that was removed in #1512

mozilla-services/screenshots,fzzzy/pageshot,mozilla-services/pageshot,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot,fzzzy/pageshot,fzzzy/pageshot,mozilla-services/screenshots,mozilla-services/pageshot,fzzzy/pageshot