Use eager retransmission if the transport is lossy and cheap.

bramble-core/src/test/java/org/briarproject/bramble/test/TestTransportConnectionWriter.java

@@ -35,6 +35,11 @@ public class TestTransportConnectionWriter
 		return 60_000;
 	}
 
+	@Override
+	public boolean isLossyAndCheap() {
+		return false;
+	}
+
 	@Override
 	public OutputStream getOutputStream() {
 		return out;