patch to dovecot script for "Logged out rcvd"

Hello,

to prevent these lines:

dovecot: service=imap, user=..., ip=[...]. Logged out rcvd=..., 
sent=...: X Time(s)

(... being potential sensitive, X usually 1 but also seen higher)

from coming up as unmatched this patch

@@ -282 +282 @@
-   } elsif ($ThisLine =~ /Logged out (bytes|top|in)=.*/) {
+   } elsif ($ThisLine =~ /Logged out (bytes|top|in|rcvd)=.*/) {

could be applied to

/usr/share/logwatch/scripts/services/dovecot

I have adjusted the script to this for about a week now on several
systems and it works fine.

cheers
emmo