refactor(form): Refactor props definition in mode-selector

Use defaultProps to set default values for label, showLabel. Update propTypes definition.

Author: David Emory

lib/components/form/mode-selector.js

@@ -6,11 +6,16 @@ import { setMode } from '../../actions/form'
 
 class ModeSelector extends Component {
   static propTypes = {
-    location: PropTypes.object,
+    config: PropTypes.object,
     label: PropTypes.string,
-    setLocation: PropTypes.func,
-    showLabel: PropTypes.boolean,
-    type: PropTypes.string // replace with locationType?
+    mode: PropTypes.string,
+    setMode: PropTypes.func,
+    showLabel: PropTypes.boolean
+  }
+
+  static defaultProps = {
+    label: 'Mode',
+    showLabel: true
   }
 
   _onChange = (evt) => {
@@ -29,9 +34,7 @@ class ModeSelector extends Component {
   }
 
   render () {
-    const { config, mode } = this.props
-    const label = this.props.label || 'Mode:'
-    const showLabel = this.props.showLabel === undefined ? true : this.props.showLabel
+    const { config, mode, label, showLabel } = this.props
 
     return (
       <form>