Incorrect rates for ZAR and NAD

[sedrubal]

Like it was reported for many other currencies, the values returned for NAD and ZAR are wrong.

❯ curl -q 'https://api.exchangerate.host/2022-07-23?base=ZAR&symbols=NAD'
{"success":true,"historical":true,"base":"ZAR","date":"2022-07-23","rates":{"NAD":0.940898}}

ZAR and NAD always have an exchange rate of 1 (by definition). See also https://www.oanda.com/currency-converter/en/?from=ZAR&to=NAD&amount=1

For the value of 1 USD I found following results (for 2022-07-23):

currency	exchangerate.host	oanda.com
NAD	15.839984	16.9188
ZAR	16.834961	16.9188

So in my opinion NAD has to be fixed.