[web/request] Prune extraneous 'pageid' from generated ajax URL parameters (closes #2758130) If 'pageid' is given through extraparams, it is sent twice to the browser. On the JS side, the final URL loadxhtml() will end up using will have 'pageid' set twice which CubicWeb will readily accept as a list. Pruning this parameter makes sure it is exactly once.

\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
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\~$
\#.*?\#$
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^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/