refactor(iOS): cleanup no. 1 in RNSScreenStackHeaderConfig.updateViewController:withConfig:animated:
#2798
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Description
This method is very hard to read & it is very scary to refactor
since as far as I remember, sometimes even call order matters here.
Therefore, I've decided to split the refactoring process into many small PRs.
This PR improves local variable naming & extracts LTR handling to separate method.
Test code and steps to reproduce
Nothing should change. LTR works as earlier. Can be tested in Example by toggling RTL mode (there is a button for it).
Checklist