Fix findID method for entity

[Lainow]

Checklist before requesting a review

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• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.
• This change requires a documentation update.

Description

• It fixes !34752 and linked with datainjection/433
• Here is a brief description of what this PR does

The findId method added a new condition in the WHERE, for example glpi_entities.id = 0. However, even when the method searches for an entity in the glpi_entities table, it continues to add this condition, which prevents the entity being found, as the condition becomes incorrect.

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