Correct getMySQLTimezoneOffset() to not round timezones and cut off minutes

[danny6167]

The current version of getMySQLTimezoneOffset() assumes that all timezones are whole hours, no minutes. This assumption was wrong.

This caused issues with schedules as the timezone offset we are setting up our database connections were wrong because of this in some timezones.

Fixes #4821

[danny6167]

A little proof that the proposed change returns what we need it to

root@pterotest:/var/www/pterodactyl# php artisan tinker
Psy Shell v0.11.8 (PHP 8.1.21 — cli) by Justin Hileman
>>> $timezone = "Australia/Darwin"
=> "Australia/Darwin"

>>> Pterodactyl\Helpers\Time::getMySQLTimezoneOffset($timezone)
=> "+09:30"

[Zephira58]

Applied this patch to my Petro install as i was having issues with the backup system here's a before and after.
Ps: Thanks for letting me know about this on discord danny, your a life saver!

Without

With

[matthewpi]

Superseded by 04d83ed

Future PRs need to go into 1.0-develop unless they are for v2.