Dropped alternative file logger specification in logback configuration file.

The appender section for FILE_COMPAT has been commented-out:

<!-- Alternative file logger using a more compact log pattern. If enable, FILE file logger is required to be disabled (and vice versa) -->
<!--
<appender name=FILE_COMPAT class=ch.qos.logback.core.rolling.RollingFileAppen der>
<file>/var/log/open-xchange/open-xchange.log.0</file>
<rollingPolicy class=com.openexchange.logback.extensions.FixedWin dowRollingPolicy>
<fileNamePattern>/var/log/open-xchange/open-xchange.log.%i</fileNamePattern>
<minIndex>1</minIndex>
<maxIndex>99</maxIndex>
</rollingPolicy>
<triggeringPolicy class=ch.qos.logback.core.rolling.SizeBasedTrigger ingPolicy>
<maxFileSize>2MB</maxFileSize>
</triggeringPolicy>
<encoder class=com.openexchange.logback.extensions.Extended PatternLayoutEncoder>
<pattern>%d{MMM