bug: event ending at midnight doesn't display correctly

[User0149]

If I create an event with the end time at 12:00 AM, this is interpreted correctly as after 11:59 PM (https://github.com/devsoc-unsw/notangles/blob/602c7397ddf3a2a73d75b923781e77b6774742d6/client/src/utils/createEvent.ts#L73C3-L73C87).

However, if I edit an event and set its end time to 12:00 AM, this is interpreted as before 12:01 AM on that day (i.e., the start of the day, and the event displays weirdly).

Steps to recreate:

1. Create an event
2. Edit its end time to 12:00 AM.

I'm working on the bug fix right now. PR coming soon.