fix: update load balance model failed

[luckylhb90]

Checklist:

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• Please open an issue before creating a PR or link to an existing issue
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Description

update load balance model failed

Fix #8669
Fix #8591

Type of Change

• 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 not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

[takatost]

This line means that if the config_id is inconsistent during an update but matches the name of another config, an error is raised, which is expected behavior.

I believe the root cause of this error should be checked. It might be that the update config ID is different from the previous one, or there could be other reasons.