[FIX] test_main_flows: Fix not deterministic tour in bank reconciliation widget

In https://github.com/odoo/odoo/commit/4fb0933986534e31337aa1dce3478a67deea72de

, we faced an owl error when changing the tour:
"Component is destroyed"

This is due to the tour leaving the kanban view right after clicking on the "Validate" button.
After the validation, the kanban view is reloaded that is triggering a call to "web_search_read".
For some reason, the 'web_search_read' was triggered right after the component is destroyed.
To fix that issue, some additional steps have been added to the tour but this was just making the tour failing in a not determinist way.
Since the root cause of the issue has been fixed since, such additional steps are no longer needed.

closes odoo/odoo#102662

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