fix checkbox default state (#712)

Signed-off-by: Yan Zhang <[email protected]>

Author: Eskibear

src/overview/assets/index.html

@@ -187,7 +187,7 @@ <h3 class="font-weight-light">Configuration</h3>
     <div class="row">
       <div class="col">
         <div class="form-check">
-          <input type="checkbox" class="form-check-input" id="showWhenUsingJava" checked>
+          <input type="checkbox" class="form-check-input" id="showWhenUsingJava">
           <label class="form-check-label" for="showWhenUsingJava">Show overview page when using Java</label>
         </div>
       </div>

src/welcome/assets/components/ControllerPanel.tsx

@@ -10,9 +10,6 @@ export default class ControllerPanel extends React.Component<{
 }> {
   render() {
     let {showWhenUsingJava} = this.props;
-    if (showWhenUsingJava === undefined) {
-      showWhenUsingJava = true;
-    }
 
     return <Form>
         <Form.Check defaultChecked={showWhenUsingJava} label="Show welcome page when using Java" onChange={toggleVisibility}/>