[fix] fix usage of docker environment variable INSTANCE_NAME

INSTANCE_NAME was ignored.

close #65

dockerfiles/docker-entrypoint.sh

@@ -68,7 +68,7 @@ patch_searx_settings() {
 
     # update settings.yml
     sed -i -e "s|base_url : False|base_url : ${BASE_URL}|g" \
-       -e "s/instance_name : \"searx\"/instance_name : \"${INSTANCE_NAME}\"/g" \
+       -e "s/instance_name : \"searxng\"/instance_name : \"${INSTANCE_NAME}\"/g" \
        -e "s/autocomplete : \"\"/autocomplete : \"${AUTOCOMPLETE}\"/g" \
        -e "s/ultrasecretkey/$(openssl rand -hex 32)/g" \
        "${CONF}"