[Redesign] Bolder object names for ObjectItemListView

Summary: Ref T8099. I think this got overwritten at some point, but they should be full bold, not semi bold.

Test Plan: inspect elements

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D12923