[web] clean up edited label

Summary:
Small cleanup diff which simplifies the logic around the editedLabel and always makes the structure of the web InlineEngagement component symmetrical to the native InlineEngagement component

Depends on D8678

Test Plan: flow and confirmed that there were no regresions with the web InlineEngagement

Reviewers: atul, kamil

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8684