[web/data] Remove broken backward compatibility function
popupLoginBox() was deprecated in favor of cw.htmlhelpers.popupLoginBox()
However, the use of cw.utils.deprecatedFunction() is broken. In firebug:
>>> popupLoginBox()
TypeError: newfunc is undefined cubicweb.js:113 (ligne 13)
This function was modified back in 2010, so it's been broken for 4 years.
Let's just get rid of it. Closes #4042978
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/