Count does not work with masterKey on postgres

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

Using query.count({useMasterKey: true}) returns 0 objects.

Steps to reproduce

it('count objects', async () => {
    const obj = new Parse.Object('TestObject');
    const obj2 = new Parse.Object('TestObject');
    await Parse.Object.saveAll([obj, obj2]);
    const query = new Parse.Query('TestObject');
    const count = await query.count({ useMasterKey: true });
    equal(count, 2); // this fails, count is 0.
  });

Actual Outcome

Count is 0

Expected Outcome

Count should return.

Environment

Server

• Parse Server version: 5.3.0
• Operating system: macos
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): localhsot

Database

• System (MongoDB or Postgres): Postgres
• Database version: latest
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): local

Client

• SDK (iOS, Android, JavaScript, PHP, Unity, etc): js
• SDK version: -

Logs

Start by running the provided JavaScript reproduction against Parse Server 5.3.0 with PostgreSQL, then trace the query.count path and the PostgreSQL adapter. Done means the same setup returns 2 for two saved TestObject instances when useMasterKey is true, with a regression test covering the behavior.