TT Brokerage Model Doesn't Validate StopLimit Orders

[DerekMelchin]

Expected Behavior

The TT brokerage model validates StopLimit orders

Actual Behavior

The stop-limit validation logic in IsValidOrderPrices never executes.

Potential Solution

In this line, replace OrderType.StopMarket with OrderType.StopLimit.

Reproducing the Problem

N/A

System Information

N/A

Checklist

• [x] I have completely filled out this template
• [x] I have confirmed that this issue exists on the current master branch
• [ ] I have confirmed that this is not a duplicate issue by searching issues

• [ ] I have provided detailed steps to reproduce the issue