Fix welders running an additional time when no damage remains. (#43321)

Update RepairableSystem.cs

Content.Shared/Repairable/RepairableSystem.cs

@@ -42,6 +42,8 @@ public sealed partial class RepairableSystem : EntitySystem
         else
             RepairAllDamage((ent, damageable), args.User);
 
+        totalDamage = _damageableSystem.GetTotalDamage((ent.Owner, damageable));
+
         args.Repeat = ent.Comp.AutoDoAfter && totalDamage > 0;
         args.Args.Event.Repeat = args.Repeat;
         args.Handled = true;