fix: bad logic breaking main row normal collapsed behavior

[roperzh]

Summary of changes:

When we refactored DnD of timeline rows, we introduced a new helper prop forceCollapse in order to force the rows to be collapsed when a drag is being performed, but since what we really want is to collapse all rows except Main I introduced some faulty logic to handle this specific scenario.

This fixes this logic by not assuming that the Main row has to be always expanded.

Asana Task: https://app.asana.com/0/1114158148688266/1117678624456373

Regressions to look for:

• DnD, collapsing & expanding rows.

Completed checkin tasks:

• [x] Updated changelog/public/latest.json.

[stristr]

LGTM.