[FIX] account: numerous reconciliation models

- Create many reconciliation models (more than 100)
- Try to create a manual reconciliation entry

The reconciliation models buttons are displayed on top of all fields,
making it impossible to encode any data.

We limit the size of the `div` to 54 pixels, which corresponds to 3
lines of buttons. All buttons are still accessible thanks to a
scrollbar.

opw-1890781

closes odoo/odoo#30212

addons/account/static/src/less/account_reconciliation.less

@@ -272,6 +272,10 @@
             overflow: auto;
             border: 1px solid #ddd;
             border-radius: 5px;
+            > div.quick_add > .o_reconcile_models {
+                max-height: 54px;
+                overflow: auto;
+            }
         }
         table {
             width: 49%;