Incorrect SEP31 check of `enabled` flag

[lijamie98]

What version are you using?

What did you do?

Implemented SEP-31 receiving anchor.

What did you expect to see?

Demo wallet should accept the /info response.

What did you see instead?

not enabled for Deposit.

The problem is in the source code here: https://github.com/stellar/stellar-demo-wallet/blob/master/packages/demo-wallet-shared/methods/sep31Send/checkInfo.ts#L35

However, SEP-31 does not specify the enabled flag.