message: Negative growth threshold scales with era
diff: @@ -1259,7 +1259,7 @@ def updateEconomyTrend(iPlayer):
  iCivicEconomy = pPlayer.getCivics(3)
  iPositiveThreshold = 5
  - iNegativeThreshold = 2
  + iNegativeThreshold = min(2, pPlayer.getCurrentEra() / 2)
  if iCivicEconomy == iCentralPlanning: iNegativeThreshold = 0
  