message_edit: Repair incorrectly moved with_first_message_id function.
message_edit: Repair incorrectly moved with_first_message_id function.

Commit 9aa5082d63e9d2f36c1055c5a855ea2fc1f61123 (#20673) incorrectly
changed the name of the error callback passed to channel.get.  This
prevented reporting of errors while moving a topic.  Fix it.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

andersk/zulip,rht/zulip,rht/zulip,andersk/zulip,andersk/zulip,zulip/zulip,zulip/zulip,zulip/zulip,andersk/zulip,rht/zulip,zulip/zulip,andersk/zulip,rht/zulip,zulip/zulip,andersk/zulip,zulip/zulip,rht/zulip,rht/zulip,rht/zulip,zulip/zulip,andersk/zulip