Error Saving Workflow

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## Description
*A clear description of the bug*
I cannot save my workflow through the napari-allencell-segmenter in the napari GUI. I am new to napari and do not know Python, so this may be a very basic issue that can be fixed easily. The error doesn't change if I try to save before or after setting the pre-processing, core, and post-processing steps. My workflow is for h2b_interphase.

### Error message
```
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
File C:\napari\envs\napari-0.4.18\lib\site-packages\napari_allencell_segmenter\view\workflow_steps_view.py:241, in WorkflowStepsView._btn_save_workflow_clicked(self=, checked=False)
240 def _btn_save_workflow_clicked(self, checked: bool):
--> 241 file_path, _ = QFileDialog.getSaveFileName(
QFileDialog =
self =
QFileDialog.Option.DontUseNativeDialog = PySide2.QtWidgets.QFileDialog.Option.DontUseNativeDialog
QFileDialog.Option.DontUseCustomDirectoryIcons = PySide2.QtWidgets.QFileDialog.Option.DontUseCustomDirectoryIcons
QFileDialog.Option =
242 self,
243 caption="Save workflow as...",
244 filter="Json file (*.json)",
245 directory="workflow.json",
246 options=QFileDialog.Option.DontUseNativeDialog | QFileDialog.Option.DontUseCustomDirectoryIcons,
247 )
249 if file_path:
250 steps = [w.get_workflow_step_with_inputs() for w in self._get_workflow_step_widgets()]

AttributeError: PySide2.QtWidgets.QFileDialog.getSaveFileName(): unsupported keyword 'directory'
* If you can't find the error message, go to Plugins > Plugin Errors > napari-allencell-segmenter
* Most of the time, the most helpful information is at the very bottom of the error output
```

## Expected Behavior
*What did you expect to happen instead?*
I expected it to save and tell me where it saved. Instead it does not save a .json file and gives an error message.

## Reproduction
*Please list the exact steps we can take to reproduce this bug.*
1. Upload images. Mine had to have a very narrow contrast range to see the nuclei
2. Create new workflow
3. Run intensity rescale
4. Press save workflow. This is where the error popped up.

## Environment
- Operating system (ex. MacOS Big Sur): Windows 10
- Python version (ex. 3.8): I do not have this
- napari version (ex. 0.4.1): napari 0.4.18
- How did you install the napari viewer (as a bundled app or through command line with `pip`)?: bundled app