Fix : replace a constant by value of prefix for a real query

git-svn-id: http://piwigo.org/svn/trunk@4628 68402e56-0260-453c-a942-63ccdbb3a9ee

install.php

@@ -323,7 +323,7 @@ define(\'DB_COLLATE\', \'\');
       );
 
     $query = '
-INSERT INTO piwigo_config (param,value,comment) 
+INSERT INTO '.$table_prefix.'config (param,value,comment) 
    VALUES (\'secret_key\',\'md5('.pwg_db_cast_to_text(DB_RANDOM_FUNCTION.'()').')\',
    \'a secret key specific to the gallery for internal use\');';
     pwg_query($query);