couple of fixes and improvements

Dahlgren's commits:
- 59d1163bc7 - Fixed key typo
- 0c3dfb381b - Make sure MyPlex PMS is updated within the last two days
- 4b5f21cd3 - Handle error where thre are no local or MyPlex PMS present
Thanks!

force discover/PlexGDM when signing into/out of Myplex