Corrected MyInput component value binding. (#1)

Author: AWolf81

src/exercises/13.js

@@ -25,7 +25,7 @@ function MyInput() {
     <Rendux.Consumer>
       {rendux => (
         <input
-          defaultValue={rendux.state.on ? 'on' : 'off'}
+          value={rendux.state.inputValue || (rendux.state.on ? 'on' : 'off')}
           placeholder="Type 'off' or 'on'"
           onChange={event => {
             if (event.target.value === 'on') {