feat(webapp): warn when deleting override token

www/webapp/src/views/CrudListToken.vue

@@ -27,7 +27,7 @@ export default {
           createSuccess: (item) => `Your new token's secret value is: <code>${item.token}</code><br />It is only displayed once.`,
           destroy: d => (d.name ? `Delete token with name "${d.name}" and ID ${d.id}?` : `Delete unnamed token with ID ${d.id}?`),
           destroyInfo: () => ('This operation is permanent. Any devices using this token will no longer be able to authenticate.'),
-          destroyWarning: d => (d.id == useUserStore().token.id ? 'This is your current session token. Deleting it will invalidate the session.' : ''),
+          destroyWarning: d => (d.id == useUserStore().token.id ? 'This is your current session token. Deleting it will invalidate the session.' : (!!d.user_override ? `This token is owned by ${d.owner}. Deleting it will revoke their authorization to manage your DNS.` : '')),
         },
         columns: {
           name: {