app_queue.c: Fix setting QUEUE_MEMBER 'paused' and 'ringinuse'.

Setting the 'paused' and 'ringinuse' options on a queue member using the
dialplan function QUEUE_MEMBER did not behave the same way as the
equivalent dialplan applications or AMI actions.

* Made queue_function_mem_write() call the set_member_paused() and
set_member_value() for the 'paused' and 'ringinuse' options respectively.
A beneficial side effect is that the queue name is now optional and sets
the value in all queues the interface is a member.

* Update QUEUE_MEMBER XML documentation.

* Fix error checking in QUEUE_MEMBER() write.

ASTERISK-25215 #close
Reported by: Lorne Gaetz

Change-Id: I3a016be8dc94d63a9cc155295ff9c9afa5f707cb