Creating a new Overlay Data Asset, it is not possible to set the Size of Textures Channels to insert textures

[Assambra]

Describe the bug Creating a new Overlay Data Asset, setup the Material but it is not possible to set the texture channels to 2 to insert textures.

Environment (please complete the following information):

• Unity Version: 2022.3.18f1
• UMA Version: 2.13 alpha 4
• Rendering Pipeline: standard/none
• Platform Build (if not editor):

To Reproduce Steps to reproduce the behavior:

1. Create a new Overlay Data Asset
2. Add some Material
3. Textures Channels -> Size -> insert some value e.g. 2, hit enter
4. Error 1: Retrieving array element that was out of bounds UnityEditor.SerializedProperty:GetArrayElementAtIndex (int)
5. Error 2: NullReferenceException: Object reference not set to an instance of an object UnityEditor.EditorGUILayout.IsChildrenIncluded (UnityEditor.SerializedProperty prop) (at <8e887700cd7e4674989da7b046e8eaa6>:0)

[Jaimi]

Fixed in Feature-13 branch