fix: prefab processor dirty up port (up port) (#3103)

* fix

NetworkPrefabProcessor now marks the default NetworkPrefabsList ScriptableObject asset as dirty if there are new imports OR deletions.

* update

adding changelog entry

* update

adding pr number to entry

Author: NoelStephensUnity

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -19,6 +19,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 
 ### Fixed
 
+- Fixed issue where `NetworkPrefabProcessor` would not mark the prefab list as dirty and prevent saving the `DefaultNetworkPrefabs` asset when only imports or only deletes were detected.(#3103)
 - Fixed issue with nested `NetworkTransform` components clearing their initial prefab settings when in owner authoritative mode on the server side while using a client-server network topology which resulted in improper synchronization of the nested `NetworkTransform` components. (#3099)
 - Fixed issue with service not getting synchronized with in-scene placed `NetworkObject` instances when a session owner starts a `SceneEventType.Load` event. (#3096)
 - Fixed issue with the in-scene network prefab instance update menu tool where it was not properly updating scenes when invoked on the root prefab instance. (#3092)

com.unity.netcode.gameobjects/Editor/Configuration/NetworkPrefabProcessor.cs

@@ -132,7 +132,7 @@ bool ProcessDeletedAssets(string[] strings)
 
             // Process the imported and deleted assets
             var markDirty = ProcessImportedAssets(importedAssets);
-            markDirty &= ProcessDeletedAssets(deletedAssets);
+            markDirty |= ProcessDeletedAssets(deletedAssets);
 
             if (markDirty)
             {