Make the no_coverart and no_preview images more fanart friendly.

modified:   images/no_coverart.png
new file:   images/no_coverart_with_fanart.png
modified:   images/no_preview.png
new file:   images/no_preview_with_fanart.png
modified:   recordings-ui.xml
modified:   schedule-ui.xml
modified:   video-ui.xml