Prop 79: Update maximum_short_take_profit_price_ratio to 0.999999

This proposal updates the maximum price ratio required for setting a take-profit order on a short position. By changing the maximum_short_take_profit_price_ratio to a value just below 1 (0.999999), it removes previous restrictions and allows users to place take-profit orders much nearer to their initial entry price. This is the maximum value permitted by the ValidateBasic function.