Fix: Ensure accurate mapping in AvatarBoneMirror class

[hyunaseo]

• Corrected logic in SetMirroredBonePair to avoid incorrect mapping caused by FindChildRecursive.
• Ensured that the correct child transforms are matched with their mirrored counterparts.
• Prevents mapping issues where Rendered_Head was matched instead of Head.

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Description

• This change fixes an issue in the AvatarBoneMirror class, specifically in the SetMirroredBonePair method, where incorrect bone mapping occurred due to the improper use of FindChildRecursive. The fix ensures correct child transforms, like Head, are matched with their mirrored counterparts, avoiding incorrect pairs like Rendered_Head.

How to Test

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Checklist

• Tests written or updated for the changes.
• Documentation is updated.
• Changelog is updated.