When choosing an image url from non-odoo pages, there is an access token
sent at the end of url. Because of this, slide_course_publisher_standard
didn't work as it expected jpg image name at the end. Now it will simply
find a match for said jpg image and won't fail. Also, before this
commit, default image was not editable with website editor.
Task-2908029
closesodoo/odoo#103620
X-original-commit: 00f9fca584f39d028108762dccef11447747b591
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>