fix _rundeck_external_address is undefined
Summary
During projects action there is an error _rundeck_external_address is undefined.
Steps to reproduce
Run projects action.
Expected behavior
No errors and update on projects.
Actual behavior
Error.
Relevant logs and/or screenshots
The error was: '_rundeck_external_address' is undefined\Possible fixes
Change _rundeck_external_address to rundeck_root_url.