.hideShowPassword-field not added on init

Noticing that when a password field is initialized, class "hideShowPassword-field" is not assigned to the input element. The class is only added after clicking the toggle button for the first time.

Traced it to `if (! this.options.enable || this.isType()) return false;` in the `updateElement` function. On init, both evaluate to true.

Is this by design?

Thanks for making your plugin available.
