Fix for contact-us when logged in - fixes #1394

[vyruss]

Fixes #1394 .

Changes proposed in this PR:

• cater for logged in users

[briri]

The changes should resolve the reported bug, but I suggest making some mods to give the user a better experience if an error is encountered.

[briri]

We should technically do the @contact.save check regardless of whether or not the user is signed in. Would also be good to do a render instead of redirect on failure so that the user doesn't lose the text they've entered in the fields.
Maybe something like (pseudocode .... you might need to tweak):

@contact = ContactUs::Contact.new(params[:contact_us_contact])
flash[:alert] = nil

if !user_signed_in? && !verify_recaptcha(model: @contact)
  flash[:alert] = _('Captcha verification failed, please retry.')
end
if !flash[:alert].present? && @contact.save
  redirect_to(ContactUs.success_redirect || '/', :notice => _('Contact email was successfully sent.'))
else
  flash[:alert] = _('Unable to submit your request') unless flash[:alert].present?
  render 'new'
end

[vyruss]

@briri done.

[briri]

looks good. thanks for making those changes