[native] Minor cosmetic fixes.

presto-native-execution/presto_cpp/main/PrestoTask.h

@@ -98,13 +98,15 @@ struct PrestoTask {
   /// Time point (in ms) when the last message (any) came for this task.
   // TODO (spershin): Deprecate it, use only the 'lastCoordinatorHeartbeatMs'.
   uint64_t lastHeartbeatMs{0};
+
   /// Time point (in ms) when the last message came for this task from the
   /// Coordinator. Used to determine if the Task has been abandoned.
   uint64_t lastCoordinatorHeartbeatMs{0};
+
   /// Time point (in ms) when the time we updated Task stats.
-  uint64_t lastTaskStatsUpdateMs = {0};
+  uint64_t lastTaskStatsUpdateMs{0};
 
-  uint64_t lastMemoryReservation = {0};
+  uint64_t lastMemoryReservation{0};
   uint64_t createTimeMs{0};
   uint64_t firstSplitStartTimeMs{0};
   uint64_t lastEndTimeMs{0};