Fix loop sound persisting after the payload carrier is removed. (#8034)

* Properly remove units and blocks in the case that the carrier dies

* added = false

---------

Co-authored-by: Anuken <arnukren@gmail.com>

core/src/mindustry/entities/comp/BuildingComp.java

@@ -2089,6 +2089,10 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
 
     @Override
     public void remove(){
+        stopSound();
+    }
+
+    public void stopSound(){
         if(sound != null){
             sound.stop();
         }