Java 11 CS-Studio dependency: investigate why build.bat doesn't install from share location

## Where?
When doing [Dependency Updates](https://github.com/ISISComputingGroup/ibex_developers_manual/wiki/Dependency-Updates), under the CS-Studio - GUI section, it was originally advised to

> Copy the latest jdk11 to ICP, rename to follow the same format, and then update `isis_css_top\build.bat` to point at the new jdk location.

When checking build.bat, it was found that it was actually pointing to a local installation of jdk11 in C:/Program Files - the shared location in ICP was not being accessed.

The wiki was updated to reflect the historically accurate way of doing this (pointing to the C:/Program Files location as build.bat uses).

An investigation is required into why it is done this way, as a dependency required for an install is typically at a shared location.