[Bug #1088] Fixed issue in earned value chart

As earned value is using
JustDaysWithInformationGraphicSpecificationCreator it's not needed to
print intervals but just one point so now it uses printLine instead of
printIntervalLine.

FEA: ItEr75S04BugFixing

navalplanner-webapp/src/main/java/org/navalplanner/web/planner/chart/ChartFiller.java

@@ -304,7 +304,7 @@ public abstract class ChartFiller implements IChartFiller {
                 LocalDate lastDay) {
             for (LocalDate day : getDays()) {
                 BigDecimal hours = getHoursForDay(day);
-                printIntervalLine(writer, day, hours, isZoomByDayOrWeek());
+                printLine(writer, day.toDateTimeAtStartOfDay(), hours);
             }
         }