ANG-6861: After call setDisable(false), an accordion doesn't open when it was disabled by setDisable(true) from open status.

Related with ANG-6861, accordion will not close after calling setOpen(true) follow previous bug fix.
So, handle active property when open property is changed.

DCO-1.1-Signed-Off-By: Jungchae Kim <jungchae.kim@lge.com>
Merge pull request #1258 from enyojs/ANG-6861-Jungchae-accordion

ANG-6861: After call setDisable(false), an accordion doesn't open when i...

Reviewed-by: Aaron Tam (aaron.tam@lge.com)