fix: (external PR#1419) Added clear to dictionary OverrideToNetworkPrefab in NetworkManager Initialize (#1519)

Co-authored-by: Jordan <jordanrussell@live.com>

Author: 0xFA11

com.unity.netcode.gameobjects/Runtime/Core/NetworkManager.cs

@@ -609,6 +609,7 @@ private void Initialize(bool server)
 
             // Always clear our prefab override links before building
             NetworkConfig.NetworkPrefabOverrideLinks.Clear();
+            NetworkConfig.OverrideToNetworkPrefab.Clear();
 
             // Build the NetworkPrefabOverrideLinks dictionary
             for (int i = 0; i < NetworkConfig.NetworkPrefabs.Count; i++)