Add exit button to Toolset form

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Add HTML button tag after Submit button

[cred_field field='form_submit' output='bootstrap' value='Submit' class='btn btn-primary btn-lg']
<button class='btn btn-secondary btn-lg align-rigth btn-exit' onclick="history.back()">Exit</button>

Style the button same as the form_submit button

.btn-exit {
  display: block;
  float: right;
  padding: 10px 20px;
}