Fix: update error colour swatch hex value
Fix: update error colour swatch hex value

This is #B10E1E, $red = $error-colour.

alphagov/govuk_elements,gavboulton/govuk_elements,joelanman/govuk_elements,gavboulton/govuk_elements,gavboulton/govuk_elements,joelanman/govuk_elements,alphagov/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements