[FIX] web: remove leading 0 in filters float field

Steps to reproduce:

- Install Sales as an example.
- Go to Products, and try to filter them by Sales Price.
- You have 0.0 as default value, now try to remove it and put 5.

Issue: We can't delete the leading 0 even though the filter is still
working as expected.

Solution: Changed the `t-on-input` to match `t-on-change` as this is
what we use in future versions, like 15.0.

opw-3131261

closes odoo/odoo#114837

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