cubicweb #687803 when editing bookmark, modifying path/params fields doesn't mark the entity has modified [open]

(eg by checking the check box and the begin of the row). We have this (nice) behaviour on other fields, shoult also work with that custom widget introduced in 3.6

prioritynormal
typebug
done in<not specified>
load0.300
load left0.300
closed by<not specified>