fix(core/rdr3): block custom startup.meta file

[Ehbw]

Goal of this PR

Fix an issue where users having a custom startup.meta file inside of their Red Dead Redemption or Red Dead Online installation would lead to the game failing to load correctly.

How is this PR achieving the goal

By preventing the game from acknowledging the files existance. Tested with problematic startup.meta file placed in x64/data/ of my Red Dead Online installation (which is used by redm). In normal conditions this file would never exist and the function would normally return false as is. So no

This PR applies to the following area(s)

RedM

Successfully tested on

Game builds: 1491

Platforms: Windows, Linux

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues

[martonp96]

Thank you for the contribution.