Makes the ownPath portable

Author: Maël Nison

packages/react-scripts/scripts/init.js

@@ -83,7 +83,9 @@ module.exports = function(
 ) {
   const ownPackageName = require(path.join(__dirname, '..', 'package.json'))
     .name;
-  const ownPath = path.join(appPath, 'node_modules', ownPackageName);
+  const ownPath = path.dirname(
+    require.resolve(path.join(__dirname, '..', 'package.json'))
+  );
   const appPackage = require(path.join(appPath, 'package.json'));
   const useYarn = fs.existsSync(path.join(appPath, 'yarn.lock'));