Drop erp5_xhtml_gadget_style

It is now replaced by erp5_web_renderjs_ui
5 jobs for master in 0 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:41:14

failed ERP5.UnitTest-Master

01:36:39

failed ERP5.UnitTest-Master.Medusa

01:41:29

passed SlapOS.Eggs.UnitTest-Master.Python2

00:11:41

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:01