Guacamole "exposed_external" flag not working correctly.

[tamirkamara]

Describe the bug
Guacamole workspace service is exposed externally even when the "exposed externally" is not ticked.

Azure TRE release version (e.g. v0.14.0 or main):
main

Deployed Azure TRE components - click the (i) in the UI:

[tim-p-allen]

Something similar was happening to shared drive earlier this year. #3885