[bisq-network/bisq] PriceNode: exclude currencies via config (#5582)

[Kai]

@KaiWitt commented on this pull request.



>          super(refreshInterval);
         this.name = name;
         this.prefix = prefix;
+        this.env = env;
+    }
+
+    public Set<String> getSupportedFiatCurrencies() {
+        if (SUPPORTED_FIAT_CURRENCIES.size() == 0) {         // one-time initialization

`.isEmpty()` is more expressive, same in line 84 `.filter(ccy -> !ccy.isEmpty())` and the crypto currency method

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