Make paused playback restart from the cursor position, instead of the pause position.

[pgregory]

Description

When using the enter key to pause playback, it would be useful if the playback started again from the cursor position when enter is pressed again. This would allow efficient edit/tweak workflow, listening to a part of the pattern, pressing enter to stop, making some changes, and then restarting from where the cursor is to hear the effect of your changes.