Traderoute_Pct effect confuses city report popup trade breakdown
The city report popup for trade displays a confused and incorrect sum in cities with trade routes if any Traderoute_Pct effect is in play. The final trade amount reported is correct, as is the contribution from each trade route, but there's an additional spurious "(unknown)" term.
This is because the code to keep track of the running total to sanity check the calculation was not updated.
I'm looking at a rework of these sums to reduce the redundant code, but for now here's the obvious fix.