Fix windows build of RectangleEdges (facebook#35516)

Summary:
[PR: Avoid emitting mountitems for default values](facebook@56e9aa3) used a constexpr in a template, which windows is unable to compile since type at this point is incomplete. Once removed, windows is able to build again. Let me know if there's a better way to fix this!

See [10072](microsoft/react-native-windows#10072) for windows error messages

## Changelog

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[General] [Fixed] - Remove constexpr from RectangleEdges.h

Pull Request resolved: facebook#35516

Test Plan: Windows has forked this file and had the change for ~5 month, all tests pass on Windows side

Reviewed By: javache

Differential Revision: D41639514

Pulled By: rshest

fbshipit-source-id: fbe595f71a7ab0accb7a76edf58ffb6aeef1ae96

Author: TatianaKapos

ReactCommon/react/renderer/graphics/RectangleEdges.h

@@ -44,7 +44,7 @@ struct RectangleEdges {
 };
 
 template <typename T>
-constexpr RectangleEdges<T> const RectangleEdges<T>::ZERO = {};
+RectangleEdges<T> const RectangleEdges<T>::ZERO = {};
 
 template <typename T>
 RectangleEdges<T> operator+(