Fix broken --config command-line argument

[mblouin02]

Description

Reset the configuration settings at the beginning of program
execution, so that, when passing a custom --config argument
to the program, values from that file are read instead of the
default config file.

Related Issue

#2249

Motivation and Context

Config file argument was not used in the program.

How Has This Been Tested?

Reproduced the steps 1-7 described in #2249, and confirmed that the value is now correctly read.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• [N/A] I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description or feature-<issue#>-<description>

[Martin-Molinero]

Hi @mblouin02!
Thank you for the issue and PR. Let me suggest a minor change. I believe it would be better to move the Reset() call inside the if statement at https://github.com/QuantConnect/Lean/blob/master/Configuration/Config.cs#L57. That way, if another command line argument is send along with the --config it will also be taken into account.

[mblouin02]

Hi @Martin-Molinero,

I did the change that you recommended. Feel free to comment.

[Martin-Molinero]

Awesome!