Backup of settings then restore to a new Sonar instance can cause deployment failures

SONAR_HOME and sonar.web.deployDir gets stored in 'properties' table on first startup.

When performing a restore on a new sonar instance, it has the side-effect of changing the deployment path on the new instance, which can cause deployment failures if several sonar instances are hosted on the same machine, or if the path is invalid on the machine where the new instance is set up.