[web/views/formrenderer] remove `cubicweb:target` attribute on form once the target <iframe> is inserted
For some unknown reason, IE9 does not want to submit the form inside
the <iframe> when the ``cubicweb:target`` attribute exists.
(closes #5377672)
\.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/