Fixed stinger grenade lag spikes (#36641)

* Fixed stinger lag spikes

* Simplify nullable checks

* More cleanup of projectile grenades

* Remove null default from ShootProjectile

Content.Server/Explosion/EntitySystems/ProjectileGrenadeSystem.cs

@@ -77,7 +77,7 @@ public sealed class ProjectileGrenadeSystem : EntitySystem
             // slightly uneven, doesn't really change much, but it looks better
             var direction = angle.ToVec().Normalized();
             var velocity = _random.NextVector2(component.MinVelocity, component.MaxVelocity);
-            _gun.ShootProjectile(contentUid, direction, velocity, uid, null);
+            _gun.ShootProjectile(contentUid, direction, velocity, null);
         }
     }