title: can't update spree product price with non admin role
body: <p>I'm creating a Store Manger role and i want to give him access to create and update products, now I'm able to create products &amp; modify everything except price, I've tried the below but no success</p>
  
  <pre><code>can %i[update modify], Spree::Price
  </code></pre>
  
  <p>any idea how can i give my new role access to update product price ?</p>