people.wm - use (smaller) image thumbnail

use thumbnail instead of scaling down the larger image

as pointed out by Hashar this loaded kind of slow

the original code was a straight copy from MediaViewer's
"use image" link though

Change-Id: I385eed478899f99bea8744a18bb4dbb20e057116
Merge "people.wm - use (smaller) image thumbnail" into production