Fix factorn wallet overrides

Author: julian-CStack

lib/wallets/wallet/impl/fact0rn_wallet.dart

@@ -305,18 +305,22 @@ class Fact0rnWallet<T extends ElectrumXCurrencyInterface>
 
   // Typical SegWit estimation
   @override
-  Amount roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) {
+  Amount roughFeeEstimate(
+    int inputCount,
+    int outputCount,
+    BigInt feeRatePerKB,
+  ) {
     return Amount(
       rawValue: BigInt.from(
         ((42 + (272 * inputCount) + (128 * outputCount)) / 4).ceil() *
-            (feeRatePerKB / 1000).ceil(),
+            (feeRatePerKB.toInt() / 1000).ceil(),
       ),
       fractionDigits: cryptoCurrency.fractionDigits,
     );
   }
 
   @override
-  int estimateTxFee({required int vSize, required int feeRatePerKB}) {
-    return vSize * (feeRatePerKB / 1000).ceil();
+  int estimateTxFee({required int vSize, required BigInt feeRatePerKB}) {
+    return vSize * (feeRatePerKB.toInt() / 1000).ceil();
   }
 }