[CashTab] Update react-copy-to-clipboard
Summary: this was the last module to not explicitely depend on react 7. Now the whoel set of dependencies is consistent and we can let npm do its magic without invoking flags to force it to.
npm run start
Then use the wallet and check that it works as expected.
Reviewers: #bitcoin_abc, majcosta
Reviewed By: #bitcoin_abc, majcosta
Differential Revision: https://reviews.bitcoinabc.org/D8901