fix double negation to resend payment received message

Author: woodser

core/src/main/java/haveno/core/trade/protocol/SellerProtocol.java

@@ -72,7 +72,7 @@ protected void onInitialized() {
         ThreadUtils.execute(() -> {
             if (!((SellerTrade) trade).needsToResendPaymentReceivedMessages()) return;
             synchronized (trade.getLock()) {
-                if (!!((SellerTrade) trade).needsToResendPaymentReceivedMessages()) return;
+                if (!((SellerTrade) trade).needsToResendPaymentReceivedMessages()) return;
                 latchTrade();
                 given(anyPhase(Trade.Phase.PAYMENT_RECEIVED)
                     .with(SellerEvent.STARTUP))