Fix REF_PTR_SET macro self-assignment bug

[seer-by-sentry]

Fixes CLIENT-2RY. The issue was that: Write access violation in Render2DClass::Set_Texture due to this->Texture being a corrupted pointer when Release_Ref() is called.

• The REF_PTR_SET macro had a potential bug where assigning a pointer to itself (self-assignment) could lead to premature object deletion due to the order of Add_Ref and Release_Ref calls.
• The fix introduces a temporary variable to store the original dst pointer, ensuring Release_Ref is called on the old object after Add_Ref is called on the new (or same) object, preventing a race condition or premature deletion during self-assignment.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 9146331

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