get-bugzilla-attachments-by-mimetype: fix get_through_rss_query

This URL results in an error message and 0 results because "Changed" in
the UI translates to "delta_ts", not "changed" apparently.

Change-Id: I2bfdd682bb7fca229039970c209e7e409532059c
Reviewed-on: https://gerrit.libreoffice.org/72219Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
Tested-by: Michael Stahl <Michael.Stahl@cib.de>

bin/get-bugzilla-attachments-by-mimetype

@@ -260,8 +260,8 @@ def get_through_rss_query(queryurl, mimetype, prefix, suffix):
     if files != []:
         print('looking for updated bugs having %s attachment(s)' % mimetype)
         query_changed = query.copy()
-        query_changed['field0-1-0'] = 'changed'
-        query_changed['type0-1-0'] = 'changedbefore'
+        query_changed['field0-1-0'] = 'delta_ts'
+        query_changed['type0-1-0'] = 'greaterthaneq'
         query_changed['value0-1-0'] = get_changed_date(files).isoformat()
         process(query_changed, False)