MB-11964: fixed typo in log collection stop confirmation dialog

Change-Id: Iad65d960f814e2d06ba5874dedb90ee0916977aa
Reviewed-on: http://review.couchbase.org/40643
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>