Fix #10184 - Timezone not set on silent install

[jack7anderson7]

Fix #10184

Description

Fix timezone not being set when running through silent install/ cli install

Motivation and Context

How To Test This

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Final checklist

• My code follows the code style of this project found here.
• My change requires a change to the documentation.
• I have read the How to Contribute guidelines.

[ps-amaureder]

This generates a problem as soon as the Users save() method is called, as it always sets the timezone to 'UTC'.
This should get fixed
I created an Issue: #10494

[chris001]

            } else {
                $this->setPreference('timezone', 'UTC', 0, 'global');
            }

Possible solutions:

1. If in CLI install mode, and getPreference('timezone') is empty or unset, then setPreference('timezone') to UTC.
2. If getPreference('timezone') is empty or unset (this means in CLI install mode), then setPreference('timezone') to UTC.