Users save() method always sets the 'timezone' to 'UTC'

[ps-amaureder]

Issue

The fix: 'Fix #10184 - Timezone not set on silent install' introduced a bug.
Now the Users 'timezone is always set to 'UTC' if the Users save() method is called.

Possible Fix

No response

Steps to Reproduce the Issue

1. fetch User: '$user = BeanFactory::getBean('Users', $id, [], true);'
2. change the timezone: '$user->setPreference('timezone', 'Europe/Vienna', 0, 'global');'
3. save it: '$user->save();'
...

The timezone will be set to 'UTC' because of this change https://github.com/salesagility/SuiteCRM/pull/10185/files

Context

No response

Version

8.5.1

What browser are you currently using?

Chrome

Browser Version

No response

Environment Information

PHP 8, mariadb 10.6

Operating System and Version

Ubuntu 22.04