moodleVersion config option vs hardcoded moodle version download.

In the documentation
https://github.com/Azure/Moodle/blob/b34a1a7c01c7f0e3cca49e9fea9a749935b714cd/docs/Parameters.md#moodleversion
The documenatation says:
moodleVerison: The Moodle version you want to install.

Near
https://github.com/Azure/Moodle/blob/b34a1a7c01c7f0e3cca49e9fea9a749935b714cd/azuredeploy.json#L122
moodleVersion possible values is: MOODLE_402_STABLE which is fine so far, but in
https://github.com/Azure/Moodle/blob/b34a1a7c01c7f0e3cca49e9fea9a749935b714cd/scripts/install_moodle.sh#L256
the install script uses hardcoded version not the $moodleVersion variable.

Which as far as we have only one possible value is not a major problem, but it might be as far as we have more than one.

Compare the moodleVersion parameter in docs/Parameters.md and azuredeploy.json with the installation logic near line 256 of scripts/install_moodle.sh. Trace how the selected version reaches the installer, then verify that the documented and configured value is used consistently instead of a separate hardcoded version.

Written by the indexing model from the issue text.