Setting require to use cash accounts.

[gaviles]

Expected Behavior

Maybe we should add an Account Type field to the live deployer incase members don't call SetBrokerageModel in their project. When I deployed with Bitfinex, it wasn't recognizing my positions. @Martin-Molinero found out its because the default account type is margin and my Bitfinex account is a cash account.

Actual Behavior

Requres user to know and set his account type in code
SetBrokerageModel(BrokerageName.Bitfinex, AccountType.Cash)

Potential Solution

Add a configurable brokerage settings that we can make part of the deployment wizard to configure the account type.

Checklist

• I have completely filled out this template
• 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

[gaviles]

REF: https://quantconnect.slack.com/archives/GLPC3D1DE/p1638569457085500