Allow users to set the default browser via ResolverActivity

The resolver prompt now redirects users to the Default Browser page when
they tap a browser app and choose [Settings]. In that page, they can
choose the default browser (even if the tapped browser app is already
the default browser).

Bug: 124721947
Test: manual
Change-Id: I31518510fa382bd49c61ee494bf585dec0c762f8