Cleanup: use Duration.ZERO.

src/main/java/de/dennisguse/opentracks/data/models/Speed.java

@@ -82,7 +82,7 @@ public record Speed(double speed_mps) {
 
     public Duration toPace(UnitSystem unitSystem) {
         if (isZero()) {
-            return Duration.ofSeconds(0);
+            return Duration.ZERO;
         }
 
         double distance = Distance.of(speed_mps).toKM_Miles(unitSystem);

src/main/java/de/dennisguse/opentracks/stats/SegmentStatisticUpdater.java

@@ -185,8 +185,8 @@ public class SegmentStatisticUpdater {
         startTime = null;
         stopTime = null;
 
-        totalTime = Duration.ofSeconds(0);
-        movingTime = Duration.ofSeconds(0);
+        totalTime = Duration.ZERO;
+        movingTime = Duration.ZERO;
         totalDistance = Distance.ZERO;
         maxSpeed = Speed.ZERO;
         totalAltitudeGain_m = null;

src/main/java/de/dennisguse/opentracks/ui/intervals/IntervalStatisticsUpdater.java

@@ -104,7 +104,7 @@ public class IntervalStatisticsUpdater {
     @Deprecated
     private static class Interval {
         private Distance distance = Distance.ZERO;
-        private Duration time = Duration.ofSeconds(0);
+        private Duration time = Duration.ZERO;
         private Float gain_m;
         private Float loss_m;
         private HeartRate avgHeartRate;