chore: simplify handle_order_fee code

Author: xmatthias

freqtrade/freqtradebot.py

@@ -2476,10 +2476,9 @@ def apply_fee_conditional(
         return None
 
     def handle_order_fee(self, trade: Trade, order_obj: Order, order: CcxtOrder) -> None:
-        # Try update amount (binance-fix)
+        # Try update amount (binance-fix - but also applies to different exchanges)
         try:
-            fee_abs = self.get_real_amount(trade, order, order_obj)
-            if fee_abs is not None:
+            if (fee_abs := self.get_real_amount(trade, order, order_obj)) is not None:
                 order_obj.ft_fee_base = fee_abs
         except DependencyException as exception:
             logger.warning("Could not update trade amount: %s", exception)