Update MDSDaemon.cc

Update MDSDaemon.cc

Change MDS log-output line.
During mark a new MDS as STANDBY MDS  in the FSMap the following log-line will be created:
"mds.cephmds01 Monitors have assigned me to become a standby."
The last character which is a dot "." have to be removed to be identical to other MDS log-messages which also not ends with a dot at the end.

Thanks and best regards
Michael Schmaltz

Signed-off-by: Michael Schmaltz <33194208+kevinflynn387@users.noreply.github.com>