traceId.hashCode() Adding Math#abs (#5506)

oap-server/analyzer/agent-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/provider/trace/parser/listener/TraceSegmentSampler.java

@@ -32,6 +32,6 @@ public class TraceSegmentSampler {
     }
 
     public boolean shouldSample(String traceId) {
-        return traceId.hashCode() % 10000 < traceSampleRateWatcher.getSampleRate();
+        return Math.abs(traceId.hashCode()) % 10000 < traceSampleRateWatcher.getSampleRate();
     }
 }