Uninstall leaves system table row

Uninstall leaves the system table row for admin_menu. This row has no use but will persist.

+------------------------------------------------+------------+--------+-------+--------+----------+-----------+----------------+--------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| filename                                       | name       | type   | owner | status | throttle | bootstrap | schema_version | weight | info                                                                                                                                                                                                                                                                                                                                                                                                                                |
+------------------------------------------------+------------+--------+-------+--------+----------+-----------+----------------+--------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| sites/all/modules/admin_menu/admin_menu.module | admin_menu | module |       |      0 |        0 |         0 |             -1 |      0 | a:10:{s:4:"name";s:19:"Administration menu";s:11:"description";s:123:"Provides a dropdown menu to most administrative tasks and other common destinations (to users with the proper permissions).";s:7:"package";s:14:"Administration";s:4:"core";s:3:"6.x";s:7:"version";s:7:"6.x-1.4";s:7:"project";s:10:"admin_menu";s:9:"datestamp";s:10:"1242422411";s:12:"dependencies";a:0:{}s:10:"dependents";a:0:{}s:3:"php";s:5:"4.3.5";} |
+------------------------------------------------+------------+--------+-------+--------+----------+-----------+----------------+--------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+