Shotgun nerfs (#8590)

- Bojevic firerate dropped from 3 to 2
- Pellet damage from 13 to 8 (3 shotting players instead of 2 shot)
- Slightly more spread in line with the design doc. Slug spread I made as accurate as an SMG (so not quite full-screen mob hits but pretty close).

Content.Server/Weapon/Ranged/Systems/GunSystem.cs

@@ -54,8 +54,8 @@ public sealed partial class GunSystem : SharedGunSystem
                     {
                         if (cartridge.Count > 1)
                         {
-                            var angles = LinearSpread(mapAngle - Angle.FromDegrees(cartridge.Spread / 2f),
-                                mapAngle + Angle.FromDegrees(cartridge.Spread / 2f), cartridge.Count);
+                            var angles = LinearSpread(mapAngle - cartridge.Spread / 2,
+                                mapAngle + cartridge.Spread / 2, cartridge.Count);
 
                             for (var i = 0; i < cartridge.Count; i++)
                             {