[FIX] web: touch a record in a x2m

Before this commit, if a touchstart event is performed on a row in an
x2many, then a crash is displayed.

We also use this commit to rename the hasSelector props to allowSelector.
allowSelector is true if checkboxes can be present.

How to reproduce:
- go to a form view in mobile mode with an x2many field
- touch a row in the x2many (trigger an event touchstart)

Before this commit:
    An error is displayed

After this commit:
    Nothing happens.

closes odoo/odoo#98893

Related: odoo/enterprise#30773
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>