Fix dual bugs introduced in 4ccc27857a2.
Fix dual bugs introduced in 4ccc27857a2.

Obvious string formatting error plus copy-paste error.

TBR=vadimsh@chromium.org
BUG=

Review URL: https://codereview.appspot.com/201790043

madecoste/swarming,pombreda/swarming,madecoste/swarming,pombreda/swarming,luci/luci-py,pombreda/swarming,luci/luci-py,luci/luci-py,madecoste/swarming,madecoste/swarming,pombreda/swarming,luci/luci-py