[FIX] account: prevent multiple event concurency

* When clicking on the partner m2o selection field before having clicked on the bank statement line, 2 events occured:
* the bank statement line expanded
* the partner selection showed

This could lead to unwanted behavior as the renderer could update
-> Stop the propagation of a click on .o_field_widget to prevent
flickering and possible update of the statement line widget

* Always recompute the create line as sometimes the value is not correct
when removing a proposition

closes odoo/odoo#36322

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