[2D][Sprite] Mismatch in Secondary Texture order for sprites in scene causes draw batching to break

Repro steps:
- Open SampleScene, enter playmode, observe Frame Debug shows 2-3 draw calls with Axe sprite on a different call than the rest (meaning the batch is broken)
- Disable Axe gameobject or switch the Secondary Texture order of Axe sprite in Sprite Editor
- Enter playmode again and observe Frame Debug shows only 1 draw call and all sprites are batched

Expected result: Batch should not be broken when sprites in scene have different Secondary Texture order
Actual result: Batch is broken when sprites in scene have different Secondary Texture order