Install Script: Incorrect java used

As a developer, I would like the install script to use the correct java when starting the IBEX server. The last workaround was to close the remote desktop session and reconnect, which redefined where java was used. This workaround is now not workingso we need to find a new solution.

Acceptance criteria:
- The correct Java is picked up in the install script after it has been installed.
- There is a defensive check to see that the correct java is picked up
- Could be something like running `java -version` and checking that the version matches what is expected