MC-2333: UX Review

- Removed cast

Author: nathanjosiah

app/code/Magento/PageBuilder/view/adminhtml/web/ts/js/content-type/block/preview.ts

@@ -115,8 +115,8 @@ export default class Preview extends BasePreview {
                     this.placeholderText(response.data.error);
                 }
 
-                this.lastBlockId = <number>data.block_id;
-                this.lastTemplate = <string>data.template;
+                this.lastBlockId = data.block_id;
+                this.lastTemplate = data.template;
                 this.lastRenderedHtml = response.data.content;
             })
             .fail(() => {