Just revert a condition removal

Author: ApsZoldat

core/src/mindustry/logic/LExecutor.java

@@ -1431,7 +1431,7 @@ public void run(LExecutor exec){
 
             Team t = team.team();
 
-            if(type.obj() instanceof UnitType type && t != null && Units.canCreate(t, type)){
+            if(type.obj() instanceof UnitType type && !type.internal && Units.canCreate(t, type)){
                 //random offset to prevent stacking
                 var unit = type.spawn(t, World.unconv(x.numf()) + Mathf.range(0.01f), World.unconv(y.numf()) + Mathf.range(0.01f));
                 spawner.spawnEffect(unit, rotation.numf());