[Cashtab] webpack upgrade p13

Summary:
T1682

Fix color issue on hover of input fields with error msgs

Test Plan: npm start, get error msg on address input field on Send page, hover mouse over field, note no white box forms around input field

Reviewers: #bitcoin_abc, kieran709

Reviewed By: #bitcoin_abc, kieran709

Differential Revision: https://reviews.bitcoinabc.org/D11254