In the Dashboard app, expenses KPI amounts are currently expressed in the
currency they were made in, but with the currency symbol of the company
currency. It also means amounts with different currencies are aggregated.
We want the KPI to be expressed in the company currency and not in the
expense currency.
Note that even with this commit, the amounts are still mixing different
currencies if multiple companies are active
Task 3266092
closesodoo/odoo#119264
X-original-commit: e579ec5b3794d545676accdd23428557b75d05fa
Signed-off-by: Lucas Lefèvre (lul) <lul@odoo.com>