app: fix getMySQLTimezoneOffset() truncating seconds

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 pterodactyl#4821
Superseeds pterodactyl#4827

Co-authored-by: danny6167 <daniel@barteck.com.au>

Author: matthewpi

app/Helpers/Time.php

@@ -15,8 +15,6 @@ final class Time
      */
     public static function getMySQLTimezoneOffset(string $timezone): string
     {
-        $offset = round(CarbonImmutable::now($timezone)->getTimezone()->getOffset(CarbonImmutable::now('UTC')) / 3600);
-
-        return sprintf('%s%s:00', $offset > 0 ? '+' : '-', str_pad((string) abs($offset), 2, '0', STR_PAD_LEFT));
+         return CarbonImmutable::now($timezone)->getTimezone()->toOffsetName();
     }
 }