Move the network prefabs list to Assets root and tidy editor tooling

Move DefaultNetworkPrefabs.asset out of Assets/Settings back to the Assets root (where NGO expects it), and fix the PlaySceneWindow domain-reload toggle to read and write EnterPlayModeOptions correctly.

Assets/Settings/DefaultNetworkPrefabs.asset

@@ -1,36 +0,0 @@
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---- !u!114 &11400000
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-  m_Enabled: 1
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-  m_Script: {fileID: 11500000, guid: e651dbb3fbac04af2b8f5abf007ddc23, type: 3}
-  m_Name: DefaultNetworkPrefabs
-  m_EditorClassIdentifier: Unity.Netcode.Runtime::Unity.Netcode.NetworkPrefabsList
-  IsDefault: 1
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Assets/Settings/DefaultNetworkPrefabs.asset.meta

@@ -1,8 +0,0 @@
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