Pre-select workflow in case only one option is available

Steps to reproduce:
1. Ensure that only one workflow has the tags upload-ng and schedule-ng
2. Add a new event

Actual Results:
When adding the new event, the user needs to select the workflow in Recordings->Events->"Add Event"->Processing from a drop down list. This is selection must be repeated for any single event uploaded or scheduled.

Expected Results:
If there is only one workflow available, automatically select it to avoid the user having to do this all the time.

Workaround (if any):
Manually select the only option from the selection each time