Fixed a php notice in the installer.

tbrehm

2011-09-21 e41fba0f0802470ef72c6c865324af89ae9cc922

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[Definition]
failregex = (?: pop3-login|imap-login): .*(?:Authentication failure|Aborted login \(auth failed|Aborted login \(tried to use disabled|Disconnected \(auth failed).*rip=(?P<host>\S*),.*
ignoreregex =