[dev] pref - maxsize

[steve]

In config.xml, the maxsize is set as not required, so we need to add this: 
(because when we generate conf.php with the Horde admin tool, it can be 
removed)

RCS file: /repository/framework/Prefs/Prefs.php,v
retrieving revision 1.129
diff -w -b -r1.129 Prefs.php
276c276
<         if (isset($conf['prefs']['maxsize'])) {
---
 >         if (isset($conf['prefs']['maxsize']) && 
!is_null($conf['prefs']['maxsize'])) {