imagePreviewer: respect align property
imagePreviewer: respect align property

We are using the imagePreviewer for title images, and on reader apps
we need to do align start.
[endlessm/eos-sdk#2826]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib