chore: revert changes in margin utils

Author: achilleas-kal

pyinjective/utils.py

@@ -57,14 +57,14 @@ def binary_options_quantity_to_backend(quantity, denom) -> int:
 
 def derivative_margin_to_backend(price, quantity, leverage, denom) -> int:
     price_tick_size = Decimal(denom.min_price_tick_size) / pow(10, denom.quote)
-    margin = Decimal(str(price)) * Decimal(str(quantity)) / Decimal(str(leverage))
-    exchange_margin = margin * pow(10, 18 + denom.quote)
+    margin = (price * quantity) / leverage
+    exchange_margin = floor_to(margin, float(price_tick_size)) * pow(10, 18 + denom.quote)
     return int(exchange_margin)
 
 def binary_options_buy_margin_to_backend(price, quantity, denom) -> int:
     price_tick_size = Decimal(denom.min_price_tick_size) / pow(10, denom.quote)
     margin = Decimal(str(price)) * Decimal(str(quantity))
-    exchange_margin = margin * pow(10, 18 + denom.quote)
+    exchange_margin = floor_to(margin, float(price_tick_size)) * pow(10, 18 + denom.quote)
     return int(exchange_margin)
 
 def binary_options_sell_margin_to_backend(price, quantity, denom) -> int: