Fixes #8166 by modifying reference to deprecated function FlagsForFile to Settings

[samuel-emrys]

Changelog: Bugfix: Removed a reference to deprecated FlagsForFile function in place of current Settings function.
Docs: Omit.

Fixes: #8166

• Refer to the issue that supports this Pull Request: Fixes [bug] YCM generator uses deprecated FlagsForFile method instead of Settings #8166
• If the issue has missing info, explain the purpose/use case/pain/need that covers this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.
• I've opened another PR in the Conan docs repo to the develop branch, documenting this one: Not applicable

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[memsharded]

Thanks for fixing this!