[FIX] account: style account dashboard if groupby

If we use a group by on the account dashboard, the kanban tiles have the
size of a normal kanban card so all graphs and so on are overlapping
which is a little ugly.

With this changeset, we have the same base width as in the non-grouped
view (which in the non grouped view may change with flex).

On {0,MD} screen size, we get in one column full width and ignore this.

opw-1964331
closes #32659

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/account/static/src/scss/account_journal_dashboard.scss

@@ -36,6 +36,15 @@
             width: 450px;
         }
     }
+    .o_kanban_group {
+        &:not(.o_column_folded) {
+            width: 450px + 2*$o-kanban-group-padding;
+
+            @include media-breakpoint-down(sm) {
+                width: 100%;
+            }
+        }
+    }
 }
 
 // Style for the widget "dashboard_graph"