Use inputmode="numeric" for results entry

[symroe]

As per a request in Slack, the type=number input isn't useful for various reasons.

GDS moved to inputmode="numeric" for number inputs, so that's what we'll do too.

This could be moved to DC utils at some point, however as the project doesn't currently use the design system I didn't think it was worth adding there in order to make this change.

Test by going to enter results and seeing that the input type has changed.

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[Bekabyx]

I think this is a good change, but it might be worth setting the oninvalid property because the default invalid message references a requested format that we haven't actually requested

Also, the turnout % field doesn't seem to accept a number containing a decimal point, which isn't a problem if it's inferred from the turnout + electorate but is a problem if we need to go back in and edit that form at a later date because it then won't save.

In testing this I accidentally triggered the animated coin toss thing that I didn't know existed and I think I'd like to talk about that when you're back 😂

[symroe]

@Bekabyx thanks for this review. I've pushed a fixup that I think deals with all your comments (apart form the coin!)