Remove conditions for WEBGL when exporting normal map textures

Assets/VRM/UniGLTF/Scripts/IO/TextureConverter.cs

@@ -121,10 +121,6 @@ namespace UniGLTF
 
         public Texture2D GetExportTexture(Texture2D texture)
         {
-
-#if UNITY_WEBGL && !UNITY_EDITOR
-            return texture;
-#endif
             var mat = GetDecoder();
             var converted = TextureConverter.Convert(texture, glTFTextureTypes.Normal, null, mat);
             TextureConverter.RemoveTextureExtension(converted, m_extension);