[web/request] Restore attribute setting for search_state
This was dropped in 1f84295bfe95 when `search_state` attribute was turned into
a property, but without a setter. So adding a setter here restoring previous
behaviour, as some tests and cubes use it.
Related to #4875761.
/var/log/cubicweb/*.log {
weekly
missingok
rotate 10
compress
delaycompress
notifempty
create 640 root adm
sharedscripts
postrotate
if [ -x /usr/sbin/invoke-rc.d ]; then \
invoke-rc.d cubicweb reload > /dev/null 2>&1; \
else \
/etc/init.d/cubicweb reload > /dev/null 2>&1; \
fi; \
endscript
}