Need ability to set fields to clearButtonMode

[derekgreenberg]

rmq.app.alert(
  title: "Text Field", 
  message: "My style is :input", 
  style: :input, 
  placeholder: "whatever",
  clearButtonMode: true,
  default_text: "My Default Text"
) do |action_type, fields|
    puts "you entered '#{fields[:text].text}"
end

The standard clear button is displayed at the right side of the text field, when the text field has contents, as a way for the user to remove text quickly. This button appears automatically based on the value set for this property.

The default value for this property is UITextFieldViewModeNever.