In the trace file, the query execution time was incorrect in some cases,…

In the trace file, the query execution time was incorrect in some cases, specially for the statement SET TRACE_LEVEL_FILE 2.

h2/src/main/org/h2/command/Prepared.java

@@ -304,7 +304,7 @@ public abstract class Prepared {
      * @param count the update count
      */
     void trace(long startTime, int count) {
-        if (session.getTrace().isInfoEnabled()) {
+        if (session.getTrace().isInfoEnabled() && startTime > 0) {
             long time = System.currentTimeMillis() - startTime;
             String params = Trace.formatParams(parameters);
             session.getTrace().infoSQL(sqlStatement, params, count, time);