title: Set local: true as default for form_with in Rails 5
body: <p>I'm working on a project where we won't be using ajax calls for submitting the forms, so I need to put <code>local: true</code> in every form in the project, as indicated in the rails <a href="http://api.rubyonrails.org/v5.1/classes/ActionView/Helpers/FormHelper.html#method-i-form_with" rel="noreferrer">docs</a>:</p>
  
  <p><code>:local - By default form submits are remote and unobstrusive XHRs. Disable remote submits with local: true.</code></p>
  
  <p>Is there any way to set the local option as true by default?</p>
  
  <p>We're using Rails 5 <code>form_with</code> helper like this:</p>
  
  <pre><code>&lt;%= form_with(model: @user, local: true) do |f| %&gt;
      &lt;div&gt;
          &lt;%= f.label :name %&gt;
          &lt;%= f.text_field :name %&gt;
      &lt;/div&gt;
  
      &lt;div&gt;
          &lt;%= f.label :email %&gt;
          &lt;%= f.email_field :email %&gt;
      &lt;/div&gt;
      &lt;%= f.submit %&gt;
  &lt;% end %&gt;
  </code></pre>