Improve handling of loading spinner display.

Going back to /around from /report/new can trigger loadend (and the
spinner hiding function) twice (if the strategy activation starts a
read), with triggerRead aborting that read and triggering the event
itself. This means the spinner is not displayed, as the count falls
below 0. We could pin the count above 0, but instead let’s log each
layer ID while ‘active’ and switch off when they’re all gone.

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