define "false" as default bool and remove the else block

src/server/routes/apiv3/pages.js

@@ -90,14 +90,11 @@ module.exports = (crowi) => {
     const offset = +req.query.offset || 0;
     const { isTrashPage } = require('@commons/util/path-utils');
 
-    let includeTrashed;
+    let includeTrashed = false;
 
     if (isTrashPage(path)) {
       includeTrashed = true;
     }
-    else {
-      includeTrashed = false;
-    }
 
     const queryOptions = {
       offset,