chore: fix margin conversion for BO

Author: achilleas-kal

pyinjective/utils.py

@@ -69,7 +69,7 @@ def binary_options_buy_margin_to_backend(price, quantity, denom) -> int:
 
 def binary_options_sell_margin_to_backend(price, quantity, denom) -> int:
     price_tick_size = Decimal(denom.min_price_tick_size) / pow(10, denom.quote)
-    margin = (1 - (Decimal(str(price)) / pow (10, denom.quote))) * Decimal(str(quantity))
+    margin = (1 - (Decimal(str(price)) * (Decimal(str(quantity)))))
     exchange_margin = floor_to(margin, float(price_tick_size)) * pow(10, 18 + denom.quote)
     return int(exchange_margin)