Fix oneformer instance segmentation RuntimeError
Author: yhshin11
Pull request: yes

# What does this PR do?

Fixes RuntimeError when running on GPU due to inconsistent devices in OneFormerImageProcessor.

Same issue was fixed in [image_processing_mask2former.py](https://github.com/huggingface/transformers/blame/514de24abfd4416aeba6a6455ad5920f57f3567d/src/transformers/models/mask2former/image_processing_mask2former.py#L1071) but not in image_processing_oneformer.py

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Comments:
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