remove redundant qualifier

MekHQ/src/mekhq/campaign/universe/HiringHallOverride.java

@@ -35,7 +35,7 @@ public class HiringHallOverride {
  private LocalDate start;
  @XmlJavaTypeAdapter(value = LocalDateAdapter.class)
  private LocalDate end;
- @XmlElement(name = "level", required = false)
+ @XmlElement(name = "level")
  private HiringHallLevel level;