Fix incorrect source weapon in stamina damage logs (#15778)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/Weapons/Melee/Events/MeleeHitEvent.cs

@@ -44,6 +44,11 @@ public sealed class MeleeHitEvent : HandledEntityEventArgs
     /// </summary>
     public readonly EntityUid User;
 
+    /// <summary>
+    /// The melee weapon used.
+    /// </summary>
+    public readonly EntityUid Weapon;
+
     /// <summary>
     /// Check if this is true before attempting to do something during a melee attack other than changing/adding bonus damage. <br/>
     /// For example, do not spend charges unless <see cref="IsHit"/> equals true.
@@ -53,10 +58,11 @@ public sealed class MeleeHitEvent : HandledEntityEventArgs
     /// </remarks>
     public bool IsHit = true;
 
-    public MeleeHitEvent(List<EntityUid> hitEntities, EntityUid user, DamageSpecifier baseDamage)
+    public MeleeHitEvent(List<EntityUid> hitEntities, EntityUid user, EntityUid weapon, DamageSpecifier baseDamage)
     {
         HitEntities = hitEntities;
         User = user;
+        Weapon = weapon;
         BaseDamage = baseDamage;
     }
 }