Fix suggested names in Secondary Textures tab of Sprite Editor #6504
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Purpose of this PR
Why is this PR needed, what hard problem is it solving/fixing?
Code was accidentally removed during a refactor which removed suggested names from showing in the Sprite Editor
Testing status
Describe what manual/automated tests were performed for this PR
Open up a 2D URP Project.

Add a Sprite to the Project.
Open up Sprite Editor.
Navigate to Secondary Textures tab.

Add a secondary texture and ensure the suggested dropdown box is present with _MaskTex and _NormalMap
Comments to reviewers
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