fix anchor and move scroll function in adopters js

Created by: flora8984461

Fix https://github.com/EclipseFdn/eclipsefdn-project-adopters/issues/39

Some test links: https://deploy-preview-207--eclipsefdn-solstice-assets.netlify.app/iot-adopters.html#iot.leshan https://deploy-preview-207--eclipsefdn-solstice-assets.netlify.app/iot-adopters.html#iot.paho

Signed-off-by: Yi Liu yi.liu@eclipse-foundation.org