[ui] Filebrowser "my home" link should not be part of the breadcrumbs

The breadcrumbs show "my home / user / bcwalrus / examples / apps /streaming / workflow.xml ".

That is misleading. The actual path we're at is "/user/bcwalrus/examples/.../workflow.xml". So that should form the breadcrumbs. The "my home" thing should be a separate button. (We could actually use a home icon.) Clicking on the "home" button will always take people to "/user/${username}".