Change selected mode to 'Manual' when preset mode is modified

User can add or delete any category record of the preset mode using
'Edit Categories'. Change the current selected recording mode to
'Manually select settings' when user modifies the default preset
recording categories set.

BUG=682
Merge pull request #690 from kphanee/chg_manual_mode_on_edit

Change selected mode to 'Manual' when preset mode is modified