officejs: remove references to configuration_manifest_url

These web sites are not using configuration_manifest_url to refer to an
application cache, so remove the reference so that upgrader does not
check if application cache manifest is up to date
5 jobs for feat/renderjs_translation_data_post_upgrade in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

01:57:08

passed ERP5.PerformanceTest-TestRunner1

00:33:06

passed ERP5.UnitTest-TestRunner1

03:00:43

failed ERP5.UnitTest-TestRunner1

02:52:17

canceled ERP5.UnitTest-TestRunner1