[FragmentedSampleReader] Reset crypto info on change

[CastagnaIT]

Description

If crypto info has been set previously, and the current package does not have protection, it must be reset to prevent the decryptor from attempting to decrypt unencrypted content

Motivation and context

the PR #1790 highlighted another critical issue resulting from the attempt to fix the previous problem

the m_protectedDesc is cleared when there is no protection,
but you forgot to reset m_readerCryptoInfo, as member it is not cleared automatically

fix #1865

How has this been tested?

user reported n€tflix works

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