Use "fa-shopping-bag" instead of "fa-list-alt" for Owners package icon

Summary:
Ref T10939. These appear in "Subscribers" tokenizers now and we got a maybe slightly better icon in the last FA update: instead of .

(I don't feel strongly about this, the old icon just doesn't seem very evocative.)

Test Plan:
o.( O___O ).o

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10939

Differential Revision: https://secure.phabricator.com/D15913