Missing def choose_torch_device (#3834)

## What type of PR is this? (check all applicable)

- [ ] Refactor
- [ ] Feature
- [X] Bug Fix
- [ ] Optimization
- [ ] Documentation Update


## Have you discussed this change with the InvokeAI team?
- [ ] Yes
- [X] No, because:

      
## Description
Fix for
 ```
File "/home/invokeuser/InvokeAI/invokeai/app/services/processor.py",
line 70, in __process
    outputs = invocation.invoke(
File "/home/invokeuser/InvokeAI/invokeai/app/invocations/latent.py",
line 660, in invoke
    device=choose_torch_device()
NameError: name 'choose_torch_device' is not defined
```

when using scale latents node

## Related Tickets & Documents

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## QA Instructions, Screenshots, Recordings

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## Added/updated tests?

- [ ] Yes
- [ ] No : _please replace this line with details on why tests
      have not been included_

## [optional] Are there any post deployment tasks we need to perform?

invokeai/app/invocations/latent.py

@@ -22,7 +22,7 @@ from ...backend.stable_diffusion.diffusers_pipeline import (
 from ...backend.stable_diffusion.diffusion.shared_invokeai_diffusion import \
     PostprocessingSettings
 from ...backend.stable_diffusion.schedulers import SCHEDULER_MAP
-from ...backend.util.devices import torch_dtype
+from ...backend.util.devices import choose_torch_device, torch_dtype
 from ..models.image import ImageCategory, ImageField, ResourceOrigin
 from .baseinvocation import (BaseInvocation, BaseInvocationOutput,
                              InvocationConfig, InvocationContext)
@@ -38,7 +38,6 @@ from diffusers.models.attention_processor import (
     XFormersAttnProcessor,
 )
 
-
 class LatentsField(BaseModel):
     """A latents field used for passing latents between invocations"""