[devtools] Fix database creation issues for CubicWebTestTC tests
To reproduce (with a purged repo):
* python web/test/test_jscript.py
* python web/test/unittest_views_xmlrss.py
The '__default_empty_db__' will contain the wrong 'base_url'
configuration, thus breaking URLs in the xmlrss tests.
Closes #9297611.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html