use HandsontableModal in Page

src/client/js/util/Crowi.js

@@ -236,9 +236,7 @@ export default class Crowi {
   }
 
   launchHandsonTableModal() {
-    const handsonTableModalElem = document.getElementById('handsontable-modal');
-    const handsonTableModal = ReactDOM.render(<HandsontableModal />, handsonTableModalElem);
-    handsonTableModal.show();
+    this.page.getHandsontableModal().show();
   }
 
   apiGet(path, params) {

src/server/views/widget/page_modals.html

@@ -3,4 +3,3 @@
 {% include '../modal/create_template.html' %}
 {% include '../modal/duplicate.html' %}
 {% include '../modal/put_back.html' %}
-<div id="handsontable-modal"></div>