docker run command should not quote JAVA_VOL

The JAVA_VOL variable shouldn't be quoted when calling docker run in do-release-docker.sh.

+ docker run -ti --env-file /Users/peter.somogyi/projects/rm/env.list --volume /Users/peter.somogyi/projects/rm:/opt/hbase-rm '' hbase-rm:latest
docker: invalid reference format.

A similar error occurs when -j <java_home> is passed to the script:
unknown flag: --volume /Users/peter.somogyi/.sdkman/candidates/java/current:/opt/hbase-java