Added boss as radar target

core/src/mindustry/logic/RadarTarget.java

@@ -9,6 +9,7 @@ public enum RadarTarget{
     ally((team, other) -> team == other.team),
     player((team, other) -> other.isPlayer()),
     flying((team, other) -> other.isFlying()),
+    boss((team, other) -> other.isBoss()),
     ground((team, other) -> other.isGrounded());
 
     public final RadarTargetFunc func;