Time Travel: details panels in the background don't update with timestamp

[fbarl]

When travelling back in time, only the top details panel changes, resulting in stale data in the background panels when they are brought to focus by closing the top panel.

To reproduce:

1. bring up Weave Cloud dev-on-dev
2. find the scope query deployment and click on it -> details panel appears
3. click on one of the pod links in the details panel
4. jump back in time
5. close the front detail panel (of the pod)
6. observe how the query deployment panel didn't update with the new timestamp

A simple lightweight solution might be to trigger the next panel update when the front panel is closed - a more robust (and expensive) solution would be to update all the details panels on every timestamp change.