Before: On a map view, a bunch of points get loaded one by one. Each of
them triggering a new render of the controller. Currently, the useModel
hook does a deep render no matter what. If you are trying to set a
custom filter un the filter menu in the control panel, the content would
systematically diseapear (rerendered) when a new map point loaded.
After: To prevent this, setting the input node as t-model is a solution.
It allows owl to keep track of the value of the input and correctly
set it back when a render occurs.
closesodoo/odoo#100421
Signed-off-by: Géry Debongnie <ged@odoo.com>