[FIX] base: add 'flags' to _get_readable_fields

'flags' is not a field in ir.actions.act_window, but it's used to pass
parameters to generate the action window. For example,

{'flag': {'withControlPanel': False}} can be used to hide the control
panel.

in _get_readable_fields, 'flags' is not included. This makes the
configuration passed by 'flags' not work. We add 'flags' to fix the
issue.

To reproduce, go to workorder and enter the tablet view by starting
the workorder. The control panel will be shown, even though
{'flags': {'withControlPanel': False}} is passed in the returned action.

closes odoo/odoo#60150

X-original-commit: b4eaf7cebf3be577ab8eb49530fb92129faa2892
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

odoo/addons/base/models/ir_actions.py

@@ -277,6 +277,9 @@ class IrActionsActWindow(models.Model):
             "context", "domain", "filter", "groups_id", "limit", "res_id",
             "res_model", "search_view", "search_view_id", "target", "view_id",
             "view_mode", "views",
+            # `flags` is not a real field of ir.actions.act_window but is used
+            # to give the parameters to generate the action
+            "flags"
         }