[FIX] web: record datapoint context without group_by or orderedBy

Have a list view, apply a group_by and a filter with a sort parameter

Click on one record to access the form view
Have a x2m within it

Before this commit, the x2m records were loaded with a context containing
the keys orderedBy and group_by
It seems harmless at first, but even conceptually those keys should not be here
- they apply on a list of records, and not to individual ones
- they may contain field names not existing in the x2m model
Hence, when accessing another list view through an action button, the list
will try to be orderedBy or group_by with the given context
Which is plain wrong in the first place and may cause crashes

After this commit, the context of a record datapoint (representing a single record)
is stripped from the keys

Read the opw for a concrete use case
OPW 1943583

closes odoo/odoo#31706

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>