fix: update company detection in Address.php

This commit introduces a fix in the 'Address.php' file. It improves the logic for detecting whether a user belongs to a company. Now, if the 'isCompany' attribute is set and the 'company' attribute is not empty, the user will be considered part of a company.

Related: pcsg/buero#515

merged

mentioned in commit 04b8125a

This MR is included in version 3.11.3

The release is available on GitLab release.

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