Update postfix-sasl.conf

In our logfile in some cases the message is "...SASL login..." instead of "...SASL LOGIN...".
Maybe it makes sense to change the whole "SASL (?:LOGIN|login|PLAIN|(?:CRAM|DIGEST)-MD5)" block to "SASL.*", because when browsing through the internet I have seen other possibilities then "CRAM,DIGEST,..." but I'm not sure how strict the regex should be handled.