fix: resolve C4100 unreferenced parameter warnings across samples

[qiutongMS]

Description

Please include a summary of the change and/or which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Target Release

Please specify which release this PR should align with. e.g., 1.0, 1.1, 1.1 Preview 1.

Checklist

Note that /azp run currently isn't working for this repo.

• Samples build and run using the Visual Studio versions listed in the Windows development docs.
• Samples build and run on all supported platforms (x64, x86, ARM64) and configurations (Debug, Release).
• Samples set the minimum supported OS version to Windows 10 version 1809.
• Samples build clean with no warnings or errors.
• [For new samples]: Samples have completed the sample guidelines checklist and follow standardization/naming guidelines.
• Microsoft employees only: you can validate your changes by following the instructions here: https://www.osgwiki.com/wiki/WindowsAppSDK-Samples