Fix device picker minor bug

When in device picker screen, if other device triggers pairing process with own
device, after paired succssfully, it should not send intent to OppReceiver to
start file sending. We need check if the paired device is the one user selected.

Original Author: Lixin Yue
Modified by: Jaikumar Ganesh (jaikumar@google.com)

Change-Id: I32df995ba94417470cccaead492844a9c61c0846