cmake: Set CFBundleDisplayName for camera extension

[gxalpha]

Description

macOS 15 shows this in the settings (or at least I think it's only from 15, haven't seen it earlier).
This is in System Settings -> Common [or whatever it's named in English] -> Login Objects and Extensions [or similar] -> Extensions.

Before/After (German, but the important part should be obvious):

Motivation and Context

Noticed this randomly when browsing through the login items settings.
If we don't set the display name macOS will fall back on the identifier which isn't great for users.

How Has This Been Tested?

macOS 15, installed vcam and saw the new name in system settings.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[PatTheMav]

Should be fine.

[RytoEX]

LGTM