fix(ios): fixed ref counting of navTintColor #14297
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Fixes #14211.
Description:
navTintColorfor a tab group, not for windownewColorwas set to a new object and was unretained when later releasednewTintColorinside the block to holdnewColornewColorifcontroller == nilSuccessfully tested with both code examples #14211 (comment) and #13917 (comment) in simulator.