This is the view when using drill down on stock browser, there's no action
here, this is not a dialog where user can "Do something" so a button to "Do something" is meaningless.

One reason for this button was to be able to go back to stock browser, but:
 - in ERP5JS, user can go back to stock browser by clicking again on "Stock"
   action from Views actions.
 - In erp5_xhtml_style, user can click the list header or breadcrumb.