refactor: Remove extra space and applied suggested usage of classnames

Author: clowreed

components/form/prompt-input/PromptInput.es6.js

@@ -2,11 +2,9 @@ import React from 'react'
 import classnames from 'classnames'
 import PropTypes from 'prop-types'
 
-function PromptInput ( { children, className }) {
+function PromptInput ({ children, className }) {
   return (
-    <div className={classnames({
-      'ds-prompt-input': true,
-    }, className)}>
+    <div className={classnames('ds-prompt-input', className)}>
       {children}
     </div>
   )