Bad keyword "ConditionalFileNotEmpty" in generated systemd config

[markus-sara]

Describe the bug

The script modules/run-nomad/run-nomad generates a systemd config with a typo.
The generated keyword "ConditionalFileNotEmpty" in the [Unit], should be "ConditionFileNotEmpty".

To Reproduce

• Create a Nomad cluster using Terraform that uses this script to run Nomad on a server node.
• Log in to a server node, run journalctl -u nomad.service
• The output shows /etc/systemd/system/nomad.service:6: Unknown lvalue 'ConditionalFileNotEmpty' in section 'Unit'

Expected behavior

With "ConditionFileNotEmpty", I expect this error gone.