Previously the `getMySQLTimezoneOffset()` function would truncate the
seconds part of a time offset (returning `+9:00` instead of `+9:30`) for
example. This only affects timezones with offsets that contain minutes.
Closes https://github.com/pterodactyl/panel/issues/4821
Superseeds https://github.com/pterodactyl/panel/pull/4827
Co-authored-by: danny6167 <daniel@barteck.com.au>