refactor: Simplified the use of classnames

Author: clowreed

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

@@ -4,9 +4,7 @@ import PropTypes from 'prop-types'
 
 function PromptInputCommands (props) {
   return (
-    <div className={classnames({
-      'ds-prompt-input__actions-commands': true,
-    }, props.className)}>
+    <div className={classnames('ds-prompt-input__actions-commands', props.className)}>
       {props.children}
     </div>
   )

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

@@ -4,9 +4,7 @@ import PropTypes from 'prop-types'
 
 function PromptInputSelectors ({ children, className }) {
   return (
-    <div className={classnames({
-      'ds-prompt-input__actions-selectors': true,
-    }, className)}>
+    <div className={classnames('ds-prompt-input__actions-selectors', className)}>
       {children}
     </div>
   )

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

@@ -5,7 +5,7 @@ import classnames from 'classnames'
 function PromptInputTextarea ({ className, placeholder, rows, textareaRef, value, onChange, disabled }) {
   return (
     <textarea
-      className={classnames({'ds-prompt-input__textarea': true,}, className)}
+      className={classnames('ds-prompt-input__textarea', className)}
       placeholder={placeholder}
       rows={rows}
       ref={textareaRef}