Left-align text within number inputs

[seancolsen]

Fixes #2057

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[seancolsen]

@pavish I recall you having some concerns about left-aligning the text within number inputs because the cursor can sometimes jump around when editing due to the automatic grouping separators. During usability testing, I've noticed that the right alignment of numbers can be confusing for users, so I think that left-alignment has a more optimal set of tradeoffs, all things considered. I'm open to continuing to debate this if you feel strongly about it.