fix: GROWI Bot search command after transplanting search service from dev/5.0.x (#4916)

* Fixed search command

* Improved code

packages/app/src/server/service/slack-command-handler/search.js

@@ -41,7 +41,7 @@ module.exports = (crowi) => {
 
     const { searchService } = crowi;
     const options = { limit: PAGINGLIMIT, offset };
-    const results = await searchService.searchKeyword(keywords, null, {}, options);
+    const [results] = await searchService.searchKeyword(keywords, null, {}, options);
     const resultsTotal = results.meta.total;
 
     const pages = results.data.map((data) => {