Remove unsupported reCAPTCHA options
The reCaptcha settings page includes the 'reCAPTCHA options' input. This was used by reCAPTCHA v1, which has been unsupported for a long time: https://developers.google.com/recaptcha/old/docs/customization
I suggest that we remove the recaptchaOptions input and settings, to tidy up the form.
It is possible to apply some styling options to recaptcha v2+, which has been implemented in FormBuilder:
But I do not suggest adding this functionality to the general reCaptcha form. If someone feels strongly, they could add it as a series of radio/checkbox options, instead of a text string which is how the options for v1 were stored.