Update the captcha modal to not close on outside clicks

src/components/modal-root.tsx

@@ -6,7 +6,6 @@ import { useHistory } from 'react-router-dom';
 import { cancelReplyCompose } from 'soapbox/actions/compose';
 import { cancelEventCompose } from 'soapbox/actions/events';
 import { openModal, closeModal } from 'soapbox/actions/modals';
-import { startOnboarding } from 'soapbox/actions/onboarding';
 import { useAppDispatch, usePrevious } from 'soapbox/hooks';
 
 import type { ModalType } from 'soapbox/features/ui/components/modal-root';
@@ -113,8 +112,7 @@ const ModalRoot: React.FC<IModalRoot> = ({ children, onCancel, onClose, type })
       } else if ((hasComposeContent || hasEventComposeContent) && type === 'CONFIRM') {
         dispatch(closeModal('CONFIRM'));
       } else if (type === 'CAPTCHA') {
-        dispatch(startOnboarding());
-        onClose();
+        return;
       } else {
         onClose();
       }