[FIX] web: currency reload

The currency service is responsible for reloading currencies from the session_info, however it does not retrieve the correct key/value.
The issue can be reproduced  in saas-16.4:
- Activate a currency
- Accounting Dashboard > Reconcile x items
- Client stack trace
(after hard refresh the correct currencies are loaded)

closes odoo/odoo#132375

Cause: the `reloadCurrencies` method is assigning the entire session_info response object to the session's currencies
X-original-commit: bbbf836f99b0271442e5e3a7ec03f108de69ec78
Signed-off-by: Francois Georis (fge) <fge@odoo.com>
Signed-off-by: Habib Ayob (ayh) <ayh@odoo.com>

addons/web/static/src/webclient/currency_service.js

@@ -15,7 +15,7 @@ export const currencyService = {
             for (const k in currencies) {
                 delete currencies[k];
             }
-            Object.assign(currencies, result);
+            Object.assign(currencies, result?.currencies);
         }
         env.bus.addEventListener("RPC:RESPONSE", (ev) => {
             const { data, error } = ev.detail;

addons/web/static/tests/webclient/currency_service_tests.js

@@ -2,6 +2,7 @@
 
 import { ormService } from "@web/core/orm_service";
 import { registry } from "@web/core/registry";
+import { currencies } from "@web/core/currency";
 import { currencyService } from "@web/webclient/currency_service";
 import { makeTestEnv } from "../helpers/mock_env";
 import { makeFakeRPCService } from "../helpers/mock_services";
@@ -15,6 +16,14 @@ QUnit.test("reload currencies when updating a res.currency", async (assert) => {
     serviceRegistry.add("orm", ormService);
     const fakeRpc = makeFakeRPCService((route) => {
         assert.step(route);
+        if (route === "/web/session/get_session_info") {
+            return {
+                uid: 1,
+                currencies: {
+                    7: { symbol: "$", position: "before", digits: 2 },
+                },
+            };
+        }
     });
     serviceRegistry.add("rpc", fakeRpc);
     const env = await makeTestEnv();
@@ -28,6 +37,7 @@ QUnit.test("reload currencies when updating a res.currency", async (assert) => {
     ]);
     await env.services.orm.unlink("notcurrency", [32]);
     assert.verifySteps(["/web/dataset/call_kw/notcurrency/unlink"]);
+    assert.deepEqual(Object.keys(currencies), ["7"]);
 });
 
 QUnit.test(