Don't use default in exhaustive switch

Summary:
@public
removes the `default` case from an already exhaustive switch.

Reviewed By: SidharthGuglani

Differential Revision: D13451869

fbshipit-source-id: 32727330c7fce013963f5c83c95a73b230d5c938

yoga/YGValue.h

@@ -44,7 +44,6 @@ inline bool operator==(const YGValue& lhs, const YGValue& rhs) {
       return true;
     case YGUnitPoint:
     case YGUnitPercent:
-    default:
       return lhs.value == rhs.value;
   }
 }