xhtml_style: remove hashes from icons.png URLs

this change was made with:

    find product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_ckeditor/ckeditor/ -type f  | xargs sed -i 's/\\?t=445cf24ebd//g'
10 jobs for feat/ckeditor-up in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

01:12:36

passed ERP5.UnitTest-TestRunner2

02:08:25

passed ERP5.CodingStyleTest-TestRunner2

00:57:14

failed ERP5.UnitTest-TestRunner2

01:45:41

canceled ERP5.UnitTest-TestRunner2

failed ERP5.UnitTest-TestRunner2

01:31:52

canceled ERP5.UnitTest-TestRunner2

failed ERP5.UnitTest-TestRunner2

01:46:15

failed ERP5.UnitTest-TestRunner2

02:24:22

canceled ERP5.UnitTest-TestRunner2