||[FIX] account_online_synchronization: Refresh last_sync date and get the right transactions. The purpose of this commit is to fix 2 bugs. The first bug is that the user cannot retrieve transactions prior to his first synchronization, which should normally work for some providers like Plaid. The second bug is linked to the first one. When the user enters a date earlier than the one present in the last_sync field, it doesn't update if new transactions arrive. These 2 bugs are caused by the fact that we are using the wrong many2one field on account.journal (account_online_journal_id instead of account_online_account_id) and that we had a wrong domain for the search_count which allows us to see if transactions are already present in the journal.