Fix pointer to third

src/omero_mkngff/__init__.py

@@ -105,7 +105,7 @@
                   new_fileset, new_file, i-1, 'unknown');
 
       -- use the third file as the target for setId (assumed to be the first .zattrs)
-      if i = 1 then
+      if i = 3 then
           update pixels set path = trim(trailing '/' from info[i][1]), name = info[i][2]
             from (select id from image where image.fileset = old_fileset) as subquery
            where pixels.image = subquery.id;