(vlc) Dont embed useless files

[tunisiano187]

Description

Filter files to embed only the nuspec

Motivation and Context

Useless files embedded, including update.ps1

How Has this Been Tested?

on my update git

Types of changes

• Bug fix (non-breaking change which fixes an issue) ((vlc) sending wrong files #2580)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Migrated package (a package has been migrated from another repository)

Checklist:

• My code follows the code style of this repository.
• My change requires a change to documentation (this usually means the notes in the description of a package).
• I have updated the documentation accordingly (this usually means the notes in the description of a package).
• I have updated the package description and it is less than 4000 characters.
• All files are up to date with the latest Contributing Guidelines
• The added/modified package passed install/uninstall in the Chocolatey Test Environment(https://github.com/chocolatey-community/chocolatey-test-environment/). Note that we don't support the use of any other environment.
• The changes only affect a single package (not including meta package).

Issue : #2580

[AppVeyorBot]

✅ Package verification completed without issues. PR is now pending human review

[AdmiringWorm]

A small change needed before we can merge this PR.

[AppVeyorBot]

✅ Package verification completed without issues. PR is now pending human review