Use proper pattern matching instead of GOSA_LINE_BREAK hack

Description

when reading the source code i found occurence of GOSA_LINE_BREAK only in block.render.php. I was wondering if this was used anymore ?

Distribution Name and Version

Debian jessie

FusionDirectory Version

1.2

PHP version used

5.6

Origin of php packages

Debian jessie

Steps to Reproduce

Read the source code of FusionDirectory

Expected behavior:

none

Actual behavior:

none