Minor cleanup / Trail experiment

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

@@ -11,7 +11,7 @@ abstract class TrailComp implements Unitc{
     @Import UnitType type;
     @Import float x, y, rotation;
 
-    transient Trail trail = new Trail();
+    transient Trail trail = new Trail(4);
 
     @Override
     public void update(){

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

@@ -22,7 +22,7 @@ abstract class WeaponsComp implements Teamc, Posc, Rotc{
     static int sequenceNum = 0;
 
     /** weapon mount array, never null */
-    @ReadOnly @SyncLocal WeaponMount[] mounts = {};
+    @SyncLocal WeaponMount[] mounts = {};
     @ReadOnly transient float range, aimX, aimY;
     @ReadOnly transient boolean isRotate;
     boolean isShooting;