[videodb] use UpdateUniqueIDs() instead of AddUniqueIDs() in VideoDatabase::SetDetailsForMovie()

[Montellese]

Description

This changes CVideoDatabase::SetDetailsForMovie() to use UpdateUniqueIDs() instead of AddUniqueIDs() like all other CVideoDatabase::SetDetailsForXXX() methods. Right now it's not possible to remove unique IDs from movies.

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:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[Montellese]

@phate89 you added this logic but only used AddUniqueIDs() for movies. Do you remember if there was a specific reason for this?

[phate89]

I sincerely don't remember why I used that different one there. Probably I did it this way just because I structured the code like for ratings and in ratings they were like this.
I'm a little bit rusty on this code but right now I can't think of a good reason not to use UpdateUniqueIDs..