Bottom accordion keeps rounded corners when expanded

[nightbook]

Hello,

This is a two part issue dealing with collapsible sets,

1. If you have the full sized collapsible set and open the bottom button with it's rounded corners these corners stay there, this can be seen on the current version - http://jquerymobile.com/demos/1.1.0/docs/content/content-collapsible-set.html
   Simply open section 5 of the first collapsible set.
   Note: opening section 3 of the second set which has data-mini=true we don't see this behaviour, the rounded corners unround properly.
   Note: opening section 3 on a themed collapsible content data-theme="c" data-content-theme="d" we don't see this behaviour, the rounded corners unround properly.
   Only seems to be on the unmini unthemed collapsible sets.
2. If we add data-collapsed="false" to the last collapsible item on any set (mini or themed) we see the rounded corners which aesthetically doens't look right, but if we then collapse this open item and reopen it the issue goes away and the rounded corners are unrounded.

Thank you