Fix spread + burst turrets (#6069)

* Fix spread + burst turrets

* spread is 4 by default

set salvo spread to 0

* damnit

core/src/mindustry/content/Blocks.java

@@ -1675,6 +1675,7 @@ public class Blocks implements ContentList{
             recoilAmount = 3f;
             shootShake = 1f;
             burstSpacing = 3f;
+            spread = 0f;
             shots = 4;
             ammoUseEffect = Fx.casing2;
             health = 240 * size * size;