Fix "The config file will be staged, but is not whitelisted or blacklisted" WARNs

[oblm]

Description

Modified DefaultGame.ini to whitelist files that were previously throwing WARNs when building assemblies for cloud deployments.

Release note

https://github.com/spatialos/UnrealGDK/pull/3008

Tests

• I cloud deployed after I implemented this fix in order to ensure that I hadn't broken that functionality.
• I confirmed that the WARNs are gone.

Documentation

Not needed.

Primary reviewers

@mironec

[improbable-prow-robot]

Corresponding JIRA ticket: https://improbableio.atlassian.net/browse/UNR-4759