Set android:noHistory to true in QuickContacts

Right now QuickContactActivity remains even after Home
button press event, and will be reused after user's
pressing another QuickContact icon, showing previous
person's information instead of current one.

This change cleans up everything when the Activity goes
into the background.

Bug: 5112026

Change-Id: Iee5e15f592934b8d96a4e1c71e4f4ba3a262535b