[Decrypters] Introduction of protection_scheme to Widevine PSSH

[CastagnaIT]

Description

Its not clear if protection_scheme is deprecated or not, i noticed more PSSH that use it, so can be uncommented for tests

Motivation and context

How has this been tested?

tested integrity of generated pssh on axiom pssh box decoder

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• I have read the Contributing document
• My code follows the Code Guidelines of this project
• My change requires a change to the Wiki documentation
• I have updated the documentation accordingly