Parameter sweep values need to be numerical only

[lynwilhelm]

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Description

Today you can add text in the input fields in the param sweep dialog, which is funky!

Error message

[Paste your napari error output here, if any.]
* If you can't find the error message, go to Plugins > Plugin Errors > napari-allencell-segmenter
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Expected Behavior

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Reproduction

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2. [second step]
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Environment

• Operating system (ex. MacOS Big Sur): [your answer here]
• Python version (ex. 3.8): [your answer here]
• napari version (ex. 0.4.1): [your answer here, you can find it by going to help -> napari info in napari]
• How did you install the napari viewer (as a bundled app or through command line with pip)?: [your answer here]

[yrkim98]

I have this fixed in https://github.com/AllenCell/napari-allencell-segmenter/pull/150 but am waiting for a code approval before I can deploy it!