Orderbook - dont allow non-numeric characters in trading password input

[jaymansfield]

Creating a trading account forces numerical characters only (which is a good thing)

However, this form does not seem to have the same check. This should only allow numbers to be inserted:

onchainaddress:{esm99RRxKvainDsRR6UHRcju4vNnAw1ouZEw64Yfn12tc6HpQ}