Fix build regression (#142)

Author: zapo

demos/Dockerfile

@@ -5,7 +5,6 @@ COPY --chmod=0444 ./vanilla/targeting/gam360.html ./vanilla/targeting/gam360.htm
 COPY --chmod=0444 ./vanilla/targeting/gam360-cached.html ./vanilla/targeting/gam360-cached.html
 COPY --chmod=0444 ./vanilla/targeting/prebid.html ./vanilla/targeting/prebid.html
 COPY --chmod=0444 ./vanilla/targeting/prebid.js ./vanilla/targeting/prebid.js
-COPY --chmod=0444 ./integration/prebid.js ./integration/prebid.js
 COPY --chmod=0444 ./vanilla/identify.html ./vanilla/identify.html
 COPY --chmod=0444 ./vanilla/profile.html ./vanilla/profile.html
 COPY --chmod=0444 ./vanilla/witness.html ./vanilla/witness.html