[PlanarReflection] Dont use a center offset for sphere shape

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Lighting/Volume/InfluenceVolumeUI.Drawers.cs

             var maxFaceDistance = d.sphereBaseRadius.floatValue;
 
             EditorGUILayout.PropertyField(d.sphereBaseRadius, _.GetContent("Radius"));
-            EditorGUILayout.PropertyField(d.sphereBaseOffset, _.GetContent("Offset"));
+            //EditorGUILayout.PropertyField(d.sphereBaseOffset, _.GetContent("Offset"));
+            d.sphereBaseOffset.vector3Value = Vector3.zero;
 
             EditorGUILayout.Space();
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Lighting/Volume/InfluenceVolumeUI.Handles.cs

             {
                 Undo.RecordObject(sourceAsset, "Modified Base Volume AABB");
 
-                center = b.center;
                 radius = b.radius;
 
                 EditorUtility.SetDirty(sourceAsset);