Show the nearby chip for images and files too.

This revealed that we weren't initializing the nearby intent
from the original intent, so that's fixed too. This should
ensure that flags and extras from the original intent make
their way to the available and installed nearby component.

Test: Share (an image and a non-image) from DocumentsUI
Fixes: 155487375
Fixes: 155676993
Change-Id: If0c0b754a066b0ec439a866de3eae84caca7b793