fix CodeQL errors

packages/remark-lsx/src/server/routes/list-pages/index.spec.ts

@@ -119,7 +119,7 @@ describe('listPages', () => {
       expect(mocks.addNumConditionMock).toHaveBeenCalledOnce(); // throw an error
       expect(mocks.addSortConditionMock).not.toHaveBeenCalledOnce(); // does not called
       expect(resMock.status).toHaveBeenCalledOnce();
-      expect(resStatusMock.send).toHaveBeenCalledWith(error.toString());
+      expect(resStatusMock.send).toHaveBeenCalledWith('error for test');
     });
 
     it('returns 400 HTTP response when the value is invalid', async() => {
@@ -146,7 +146,7 @@ describe('listPages', () => {
       expect(mocks.addNumConditionMock).toHaveBeenCalledOnce(); // throw an error
       expect(mocks.addSortConditionMock).not.toHaveBeenCalledOnce(); // does not called
       expect(resMock.status).toHaveBeenCalledOnce();
-      expect(resStatusMock.send).toHaveBeenCalledWith(error.toString());
+      expect(resStatusMock.send).toHaveBeenCalledWith('error for test');
     });
 
   });

packages/remark-lsx/src/server/routes/list-pages/index.ts

@@ -117,9 +117,9 @@ export const listPages = async(req: Request & { user: IUser }, res: Response): P
   }
   catch (error) {
     if (isHttpError(error)) {
-      return res.status(error.status).send(error.toString());
+      return res.status(error.status).send(error.message);
     }
-    return res.status(500).send(error.toString());
+    return res.status(500).send(error.message);
   }
 
 };