Pass key= to one more GenerateManifest call.
Pass key= to one more GenerateManifest call.

Missed another place where %(key)s is assumed to be defined.

BUG=None
TEST=None
TBR=sbc@chromium.org

Review URL: https://codereview.chromium.org/998033004

Schibum/naclports,Schibum/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,Schibum/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports