This PR fixes a minor issue where using blank names in categories would lead to them being permanently* stuck as such.

Blank names are already prohibited, evident from the 400 error you receive if you try creating a category without entering anything in the name field. For some reason though, simple whitespace characters (including U+0020) are allowed. When this happens, the category gets stuck with a blank name due to the <span> element ending up with a size of 0x0, and since the click handler responsible for allowing the user to rename the category is attached to that same <span> element, you can kinda see how it goes wrong.

I realize that a change to the backend to improve handling of whitespace characters would be the more ideal solution, but this change on the frontend is incredibly simple, and it would also be nice for handling future edge cases if a similar exploit is found again.

*unless you have access to devtools, of course.

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• These changes do not have any notable side effects on other Revolt projects
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