[Cashtab] Fix typo in TxHistory

Summary: In TxHistory at line 31, the PropTypes.shape key should be 'name' instead of 'namer'

Test Plan:
in IDE:
navigate to TxHistory.js
observe that key at line 31 reads 'name'

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D11529