Correct taiga-front env variable updated

[sh0umik]

docker-compose.yml file contains env variable BASE_URL which is no use , because in the run.sh protocol and domain variable was used.

ESCAPED_BASE_URL="${BASE_PROTOCOL}:\/\/${BASE_DOMAIN}"
sed -i "s/BASE_URL/$ESCAPED_BASE_URL/g" /taiga/conf.json

So Correction would be

taigafront:
    image: dougg/taiga-front
    links:
        - taigaback:taiga-back
    ports:
        - "8080:80"
    environment:
        - "BASE_PROTOCOL=http"
        - "BASE_DOMAIN=ip-adress:8000"

Without it taiga front fails to communicate with back-end.