Most of the time people want to pause playback, rather than stop
entirely. Let's remove the button since it's not getting any use.
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>
This feature isn't used very often, and keeping the checkbox in the
sidebar looks pretty ugly.
Fixes#50: Remove Collection checkbox
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>