Fix crash on AppInfoDashboardFragment

When AppInfoDashboardFragment launch a new page,
it sets SUB_INFO_FRAGMENT(1) as request code.

This request code is same as REQUEST_REMOVE_DEVICE_ADMIN(1).
So, when AppInfoDashboardFragment got onActivityResult callback,
it will handle the event about REQUEST_REMOVE_DEVICE_ADMIN.

So, we change REQUEST_REMOVE_DEVICE_ADMIN to a unique value.

Test: manual test, robotest
Fixes: 118841475

Change-Id: Idabd62c5062ccfbf4b8acee82df7401fc9ce7484