test/unit: 24.sh - removed invalid comment about mysql

(cherry picked from commit ebe117cae681c373a3e9f32e3fb392e31605039f)

test/unit/24.sh

@@ -19,9 +19,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-# Needs a mysql database, the root user password must be given
-# in the file 'dbrootpw' in the test directory
-
 . include/common
 
 if [ ! -f ~/.pgpass ] ; then