Enemies drop ammo now

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/weapon/weapons/machine_gun.dart

@@ -7,6 +7,7 @@ class MachineGun extends Weapon {
         idleSprite: 427,
         fireFrames: [428, 429, 430],
         damage: 20,
-        msPerFrame: 80,
+        msPerFrame: 80, // MG fires faster than the Pistol
+        isAutomatic: true, // This allows holding the button!
       );
 }