fix catalyst + use_frameworks build w/header change in React-RCTFabric.podspec

[mikehardy]

Summary:

react-native 0.73 had a compile regression for macCatalyst builds with use_frameworks

There was some investigation on discord and with all credit to @cipolleschi for this header path fix, the build appears to work with this change

Changelog:

[IOS] [FIXED] - Fixed catalyst build regression in use_frameworks context

Test Plan:

I have a demonstration script that checks use_frameworks builds for ios debug, ios release and macCatalyst, it detected the problem and confirmed the fix: https://github.com/mikehardy/rnfbdemo/commits/rn73-catalyst

[cipolleschi]

As discussed in other forums, this has been superseded by a bigger effort to make RN more scalable with other Apple platforms. See this PR for reference.