revert changes to codemirroreditor.jsx

packages/app/src/components/PageEditor/CodeMirrorEditor.jsx

@@ -882,7 +882,7 @@ export default class CodeMirrorEditor extends AbstractEditor {
 
   render() {
     const mode = this.state.isGfmMode ? 'gfm-growi' : undefined;
-    const lint = this.props?.isTextlintEnabled ? this.codemirrorLintConfig : false;
+    const lint = this.props.isTextlintEnabled ? this.codemirrorLintConfig : false;
     const additionalClasses = Array.from(this.state.additionalClassSet).join(' ');
     const placeholder = this.state.isGfmMode ? 'Input with Markdown..' : 'Input with Plain Text..';
 
@@ -983,8 +983,8 @@ export default class CodeMirrorEditor extends AbstractEditor {
 }
 
 CodeMirrorEditor.propTypes = Object.assign({
-  editorOptions: PropTypes.object,
-  isTextlintEnabled: PropTypes.bool,
+  editorOptions: PropTypes.object.isRequired,
+  isTextlintEnabled: PropTypes.bool.isRequired,
   emojiStrategy: PropTypes.object,
   lineNumbers: PropTypes.bool,
   onMarkdownHelpButtonClicked: PropTypes.func,