don't list out all sourceSkpFile names in the rebaseline_server UI

(the list is long and crowds out the results themselves; better to use
a text filter to select the sourceSkpFiles of interest)

R=stephana@google.com
TBR=stephana
NOTREECHECKS=true
NOTRY=true

Author: epoger@google.com

Review URL: https://codereview.chromium.org/451853002
3 files changed