GLTFLoader: Assign extras to texture. (#28226)

* Assign extras to texture in GLTFLoader

* Update GLTFLoader.js

Clean up.

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Co-authored-by: Michael Herzog <michael.herzog@human-interactive.org>

examples/jsm/loaders/GLTFLoader.js

@@ -3317,6 +3317,8 @@ class GLTFParser {
 
 			}
 
+			assignExtrasToUserData( texture, sourceDef );
+
 			texture.userData.mimeType = sourceDef.mimeType || getImageURIMimeType( sourceDef.uri );
 
 			return texture;