Fix DedicatedServerPrintf_fp definition

[MaddTheSane]

Pull Request Type

• [ ] GitHub Workflow changes
• [ ] Documentation or Wiki changes
• [ ] Build and Dependency changes
• [X] Runtime changes
  • [ ] Render changes
  • [ ] Audio changes
  • [ ] Input changes
  • [ ] Network changes
  • [X] Other changes

Description

Fix DedicatedServerPrintf_fp to actually match the definition of PrintDedicatedMessage. This also quiets three warnings about "ISO C++11 does not allow conversion from string literal to 'char *'"

Checklist

• [X] I have tested my changes locally and verified that they work as intended.
• [X] I have documented any new or modified functionality.
• [X] I have reviewed the changes to ensure they do not introduce any unnecessary complexity or duplicate code.
• [X] I understand that by submitting this pull request, I am agreeing to license my contributions under the project's license.