Fix Dockerfile host and syntax (#1703)

Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update \
     && apt-get install -y git npm build-essential libpq-dev\
     && pip3 install --upgrade pip setuptools \
     && python3 setup.py compile_assets \
-    && pip3 install --user gunicorn psycopg2
+    && pip3 install --user gunicorn psycopg2 \
     && pip3 install --user . \
     && pip3 install --user asreview-datatools asreview-insights asreview-makita asreview-wordcloud
 
@@ -22,7 +22,7 @@ WORKDIR /app
 
 COPY --from=builder /root/.local /root/.local
 
-ENV ASREVIEW_HOST=0.0.0.0
+ENV ASREVIEW_LAB_HOST=0.0.0.0
 ENV PATH=/root/.local/bin:$PATH
 ENV ASREVIEW_PATH=/project_folder
 EXPOSE 5000