- fix wrong type in re_grep group_id column

- reported from Giovanni Coriasco, closes #1891097


git-svn-id: https://openser.svn.sourceforge.net/svnroot/openser/trunk@3677 689a6050-402a-0410-94f2-e92a70836424

lib/srdb1/schema/re_grp.xml

@@ -37,7 +37,7 @@
 
     <column id="group_id">
         <name>group_id</name>
-        <type>string</type>
+        <type>int</type>
         <size>11</size>
         <default>0</default>
         <description>Group ID</description>