Fix helper-info filename for case sensitive partition

[tytan652]

Description

helper-info.plist was named helper-Info.plist, in a normal macOS partition this is not an issue. On a case sensitive partition, this does not work and the file needs to be renamed.

Motivation and Context

I prefer case sensitive partition, so I trip over those issues and so I fix them.

How Has This Been Tested?

Configure obs-studio repo (with submodules) with cmake on a case sensitive partition, should no longer thrown errors.

Types of changes

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

Checklist:

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