Update schedule-ui.xml

If the Myth user creates a channel group with a small number of channels (9[nine], as specified by the number of channels in the guidegrid), then the listings displayed in the guidegrid do not line up with the channellist.

By forcing the height of the objects in the channellist to be equal to the rows in the guidegrid AND by removing the vertical "spread" from the channellist, the channellist rows will align correctly with the guidegrid rows no matter how many channels are in the user's selected channel group.