Data Sources Fix for Installer: Second Try

[simmonsj330]

Description

Previously, the installer was running into an error where it was not loading in the data_sources_default.json correctly.

The file is located in OpenBBUserData folder on the user's machine, however it is empty. This is on purpose. If the user does not purposefully populate this file in some way, then the terminal should use the default sources provided by OpenBB. This bug demonstrates that this is not the case for the installer. It always looks at the sources file in the user data folder. This PR fixes this by always opening the provided default sources from the correct location first (in the case of the installer.OpenBB/) and then if there is content within the user data sources file, then it will utilize that.

How has this been tested?

This has been tested by creating an installer and doing the following:

• Testing commands when using the provided data sources file
• Testing commands when adding wrong content to the OpenBBUserData data sources file to make sure it fails correctly
• Testing commands when adding correct content (copying the data_sources_default.json to the user data sources file location) to make sure it works correctly.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.