fix: FixNWFlashbangDuration (#713)

* fix: FixNWFlashbangDuration

* fix: Event wasn't called when duration of the Effect was modified

* using update

* Revert "fix: Event wasn't called when duration of the Effect was modified"

This reverts commit b41bf89.

* Revert "using update"

This reverts commit cf06cad.

Author: louis1706

EXILED/Exiled.Events/Patches/Fixes/FixNWFlashbangDuration.cs

@@ -0,0 +1,30 @@
+// -----------------------------------------------------------------------
+// <copyright file="FixNWFlashbangDuration.cs" company="ExMod Team">
+// Copyright (c) ExMod Team. All rights reserved.
+// Licensed under the CC BY-SA 3.0 license.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Exiled.Events.Patches.Fixes
+{
+    using System.Collections.Generic;
+    using System.Reflection.Emit;
+
+    using CustomPlayerEffects;
+    using Exiled.API.Features.Items;
+    using Exiled.Events.EventArgs.Player;
+    using HarmonyLib;
+    using InventorySystem;
+
+    /// <summary>
+    /// Patches <see cref="Flashed.IntensityChanged"/> to fix NW overwritting value multiple time.
+    /// </summary>
+    [HarmonyPatch(typeof(Flashed), nameof(Flashed.IntensityChanged))]
+    internal class FixNWFlashbangDuration
+    {
+        private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions)
+        {
+            yield return new CodeInstruction(OpCodes.Ret);
+        }
+    }
+}