title: Meteor AutoForm set optional field to be required
body: <p>I've the following (simplified) SimpleSchema:</p>
  
  <pre><code>EventSchema = new SimpleSchema({
      eventType: {
          type: String
      },
      kicker: {
          type: String
      },
      kicker2: {
          type: String,
          optional: true
      }
  });
  </code></pre>
  
  <p>With this I'm using AutoForm to generate a insert form. Here is a simplified version of it: </p>
  
  <pre><code>{{#autoForm schema="EventSchema" type="method" meteormethod="addEvent"}}
      {{&gt; afFieldInput name="eventType" options=getSubstitutionEventTypes type="select-radio-inline"}}
  
      {{&gt; afFieldInput name="kicker" type="select" options=this}}
  
      {{&gt; afFieldInput name="kicker2" type="select" options=this}}
  {{/autoForm}}
  </code></pre>
  
  <p>As I'm using this Schema in an other autoForm where I don't have to input "kicker2", I've set this field to be optional. But in the form mentioned above, this field is required too. So how can I override the optional setting for a field in a specific form?</p>
  
  <p>I've already tried the following, but it didn't work (required isn't rendered in the HTML):</p>
  
  <pre><code>{{&gt; afFieldInput name="kicker2" type="select" options=this required="required"}}
  </code></pre>
  
  <p>Thanks in advance!</p>