Fix absolute net gain calculation

Author: MDUYN

investing_algorithm_framework/domain/models/trade/trade.py

@@ -208,7 +208,7 @@ def net_gain_absolute(self):
 
             if self.last_reported_price is not None:
                 gain = (
-                    self.remaining *
+                    self.available_amount *
                     (self.last_reported_price - self.open_price)
                 )
 
@@ -228,7 +228,7 @@ def net_gain_percentage(self):
 
             if self.last_reported_price is not None:
                 gain = (
-                    self.remaining *
+                    self.available_amount *
                     (self.last_reported_price - self.open_price)
                 )