C++ style enums 10/N: Justify (#1396)

Summary:
X-link: https://github.com/facebook/react-native/pull/39498

Pull Request resolved: https://github.com/facebook/yoga/pull/1396

Moves internal usages of YGJustify to Justify.

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Changelog: [Internal]

Reviewed By: rshest

Differential Revision: D49336538

fbshipit-source-id: 6deb2438e3cd2989c8212ee294fd0fe4819f40ab

yoga/debug/NodeToString.cpp

@@ -146,9 +146,7 @@ void nodeToString(
     }
     if (style.justifyContent() != yoga::Node{}.getStyle().justifyContent()) {
       appendFormattedString(
-          str,
-          "justify-content: %s; ",
-          YGJustifyToString(style.justifyContent()));
+          str, "justify-content: %s; ", toString(style.justifyContent()));
     }
     if (style.alignItems() != yoga::Node{}.getStyle().alignItems()) {
       appendFormattedString(