The abilty to use a custom control panel for an action
seems to have been lost with 18e5416.
With this commit the action config can specify a custom
component to use as control panel.
Usefull for o-spreadsheet integration.
Task 2238915
closes odoo/odoo#52807
Signed-off-by: Vincent Schippefilt (vsc) <vsc@odoo.com>