💄(react) homogenize form fields colors

Based on the QA feedbacks we figured out that form fields were not all
using the exact same greyscale colors.

packages/react/src/components/Forms/Select/multi-common.tsx

@@ -108,6 +108,7 @@ export const SelectMultiAux = ({
             htmlFor={labelProps.htmlFor}
             labelId={labelProps.id}
             hideLabel={hideLabel}
+            disabled={disabled}
           >
             <div className="c__select__inner">
               <div className="c__select__inner__actions">