Fix UploadText component when height is less than 128px

[hannahblair]

Describe the bug

UploadText needs some rejigging to ensure it doesn't get cut off when the height is less than 128px.

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• I have searched and found no existing issues

Reproduction

import gradio as gr

Screenshot

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Logs

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System Info

n/a

Severity

I can work around it

[abidlabs]

This is probably true of other components whose height can be adjusted and support file upload, e.g. Image and ImageEditor