Remember password when '/bookmark'ing a joined, password-protected room.

When you are in a password-protected MUC and want it bookmarked, just running /bookmark won't store the password.

• Changesets:
  • Revision e78ed92b by mathieui on 2015-04-13T23:34:24Z:

Fix #2714 (make bare /bookmark use the current room password if there is one)