[Cashtab] Make number inputs type number and disable scroll changing

Summary:
The old way to prevent scrolling from changing number values in input fields was to make them text inputs.

But this is bad for mobile UX, when user has to manually pull up the number bad.

Use onWheel to disable scrolling changes, and make number inputs numeric.

This patches fields for agora listings and redeeming firma / xecx

Test Plan: npm test

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D18129