Fix equipment market widget not updating stock properly

1. The third argument to bought/sold wasn't passed correctly, instead the nil
valued member variable was used

2. When selling/buying from ship equipment market, it defaulted to -1 units,
should be 1.

Closes #5071

data/pigui/libs/equipment-market.lua

@@ -104,11 +104,8 @@ local defaultFuncs = {
  end,
 
  -- do something when we buy this commodity
- bought = function (self, e)
- local count = -1
- if self.tradeAmount ~= nil then
- count = self.tradeAmount
- end
+ bought = function (self, e, tradeamount)
+ local count = tradeamount or 1 -- default to 1 for e.g. equipment market
  Game.player:GetDockedWith():AddEquipmentStock(e, -count)
  end,
 
@@ -139,11 +136,8 @@ local defaultFuncs = {
  end,
 
  -- do something when we sell this items
- sold = function (self, e)
- local count = -1
- if self.tradeAmount ~= nil then
- count = self.tradeAmount
- end
+ sold = function (self, e, tradeamount)
+ local count = tradeamount or 1 -- default to 1 for e.g. equipment market
  Game.player:GetDockedWith():AddEquipmentStock(e, count)
  end,