fix bug within DefaultGroupProvider
Renaming of the SQL statements was not successful within " Renamed/prefixed all Openfire tables with 'of' to prevent conflicts with other applications in same database.". An 'f' is missing.
Fix line 38 in DefaultGroupProvider and change `"UPDATE oGroupProp SET groupName=? WHERE groupName=?";´ to `"UPDATE ofGroupProp SET groupName=? WHERE groupName=?";´