ui: make Scope Details page's Description a textarea, like Roles' (#30273)

The Scope Details page had its description field as a single line text
field. This is inconsistent with the Roles page, which has it as a
textarea allowing multiline editing.

It's true that the character limit is 255 (which is way too short and
should probably be changed imo) but newlines are useful in tweets too :)

Signed-off-by: Jade Lovelace <software@lfcode.ca>

js/apps/admin-ui/src/client-scopes/details/ScopeForm.tsx

@@ -117,7 +117,7 @@ export const ScopeForm = ({ clientScope, save }: ScopeFormProps) => {
             )}
           </>
         )}
-        <TextControl
+        <TextAreaControl
           name="description"
           label={t("description")}
           labelIcon={t("scopeDescriptionHelp")}