[FIX] purchase: fix test_main_flows.
[FIX] purchase: fix test_main_flows.

The action 'account.action_invoice_tree2' has been changed into a server action, so we want to open the tree view of invoices by modifying some values of the action we should now use the xml reference 'account.action_vendor_bill_template'.

Additionally, the help tooltip is now completed as would do the server action

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