registrationEndDateEnd filter not working well

@rootelement Can you check this please:

Call: https://api.topcoder.com/v5/challenges/?status=Active&currentPhaseName=Submission&registrationEndDateEnd=2020-10-07T16:00:00Z&perPage=10&page=1&sortBy=startDate&sortOrder=desc

status: Active
currentPhaseName: Submission
registrationEndDateEnd: 2020-10-07T16:00:00Z
perPage: 10
page: 1
sortBy: startDate
sortOrder: desc

Include challenge with Registration phase still open, example: https://api.topcoder.com/v5/challenges/0e4e8ee3-264a-45cb-8442-02aed0a24c92

scheduledEndDate: "2020-10-13T19:07:00Z"

Final Submission Guidelines

Git issue link: https://github.com/topcoder-platform/challenge-api/issues/322