Fix flaky aws remote sampler test (open-telemetry#2051)

Author: laurit

aws-xray/src/test/java/io/opentelemetry/contrib/awsxray/AwsXrayRemoteSamplerTest.java

@@ -196,7 +196,6 @@ void testJitterTruncation() {
             .setEndpoint(server.httpUri().toString())
             .setPollingInterval(Duration.ofMinutes(5))
             .build()) {
-      assertThat(samplerWithLongerPollingInterval.getNextSamplerUpdateScheduledDuration()).isNull();
       await()
           .untilAsserted(
               () -> {