Fixed postconf warnings in installer.

Till Brehm

2016-01-02 f652c5901e8230fd53bcd5f57ccd6ae69dc2b2ca

 interface/web/dns/form/dns_soa.tform.php

@@ -197,7 +197,7 @@
               'range' => '60:',
               'errmsg'=> 'minimum_range_error'),
         ),
         'default' => '86400',
         'default' => '3600',
         'value'  => '',
         'width'  => '10',
         'maxlength' => '10'