use mempool.space onion address for fee rates if tor proxy enabled

src/main/java/com/sparrowwallet/sparrow/AppServices.java

@@ -373,6 +373,10 @@ public class AppServices {
         return Tor.getDefault() != null;
     }
 
+    public static boolean isUsingProxy() {
+        return isTorRunning() || Config.get().isUseProxy();
+    }
+
     public static Proxy getProxy() {
         return getProxy(TOR_DEFAULT_PROXY_CIRCUIT_ID);
     }

src/main/java/com/sparrowwallet/sparrow/net/ElectrumServer.java

@@ -1328,7 +1328,7 @@ public class ElectrumServer {
             return new Task<>() {
                 protected Sha256Hash call() throws ServerException {
                     //If Tor proxy is configured, try all external broadcast sources in random order before falling back to connected Electrum server
-                    if(AppServices.getProxy() != null) {
+                    if(AppServices.isUsingProxy()) {
                         List<BroadcastSource> broadcastSources = Arrays.stream(BroadcastSource.values()).filter(src -> src.getSupportedNetworks().contains(Network.get())).collect(Collectors.toList());
                         Sha256Hash txid = null;
                         for(int i = 1; !broadcastSources.isEmpty(); i++) {

src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.java

@@ -25,7 +25,7 @@ public enum FeeRatesSource {
     MEMPOOL_SPACE("mempool.space") {
         @Override
         public Map<Integer, Double> getBlockTargetFeeRates(Map<Integer, Double> defaultblockTargetFeeRates) {
-            String url = "https://mempool.space/api/v1/fees/recommended";
+            String url = AppServices.isUsingProxy() ? "http://mempoolhqx4isw62xs7abwphsq7ldayuidyx2v2oethdhhj6mlo2r6ad.onion/api/v1/fees/recommended" : "https://mempool.space/api/v1/fees/recommended";
             return getThreeTierFeeRates(defaultblockTargetFeeRates, url);
         }
     },