Make require-default-props use isRequired detection

Author: alexzherdev

lib/rules/no-unused-prop-types.js

@@ -103,7 +103,7 @@ module.exports = {
 
         if (prop.node && !isPropUsed(component, prop)) {
           context.report(
-            prop.node,
+            prop.node.value || prop.node,
             UNUSED_MESSAGE, {
               name: prop.fullName
             }