Add a drawSelect to shockwave towers (#7172)

* add hover range display

* absolute buffoon

* so the local one works but that didn't

* newline

core/src/mindustry/world/blocks/defense/ShockwaveTower.java

@@ -115,5 +115,10 @@ public class ShockwaveTower extends Block{
             Fill.poly(x, y, shapeSides, shapeRadius * potentialEfficiency, Time.time * shapeRotateSpeed);
             Draw.color();
         }
+
+        @Override
+        public void drawSelect(){
+            Drawf.dashCircle(x, y, range, waveColor);
+        }
     }
 }