Re-use code of opening task details screen

[lemonboston]

This code is repeated at several places:

                Intent viewTaskIntent = new Intent(Intent.ACTION_VIEW);
                viewTaskIntent.setData(mSelectedTaskUri);
                startActivity(viewTaskIntent);

Make it like this:

        new BasicTaskDetailsUi(mSelectedTaskUri).show(this);

(Note: this comes out the #469 changeset)