fix --list for mongodl

[kevinAlbs]

JIRA TICKET (TODO)

Summary

Print results in .evergreen/mongodl.py --list.

Changes in this PR

Fix empty results from --list due to arguments defaulting to "auto". Prior to this PR:

% .evergreen/mongodl.py --quiet --list
No items matched the listed filters
(Omit filter arguments for a list of available filters)

Test Plan

Tested locally.

Checklist

Checklist for Author

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?