Change Last Active column to reflect only commit activity.

core/src/main/resources/hudson/model/View/AsynchPeople/index.jelly

@@ -103,7 +103,7 @@ THE SOFTWARE.
           <th />
           <th>${%User Id}</th>
           <th>${%Name}</th>
-          <th initialSortDir="up">${%Last Active}</th>
+          <th initialSortDir="up">${%Last Commit Activity}</th>
           <th>${%On}</th>
         </tr>
       </table>