[FIX] web: External Link

- Install Sales
- Go to Sales > Orders > Customers, 'Invoicing' tab
- Add a Bank Account

The 'External Link' button (which allows opening the form view) on the
bank account is not visible.

More generally, in the case of a One2many list view in a `<group>` tag,
the 'External Link' button of a Many2one field (which allows opening
the form view) is not visible.

The `flex: 1 0 auto;` should not be applied in the list view.

Corresponding PR in v11: #28812
opw-1903158

addons/web/static/src/scss/form_view.scss

@@ -343,13 +343,13 @@
             }
         }
 
-        :not(.o_row) > .o_field_widget,
+        :not(.o_row):not(.o_data_cell) > .o_field_widget,
         .o_row > .o_field_widget:last-child { // Note: this does not take care
                                               // of an invisible last-child but
                                               // it does not really matter
             // Makes extra buttons (e.g. m2o external button) overflow on the
             // right padding of the parent element
-            .o_input_dropdown {
+            > .o_input_dropdown {
                 flex: 1 0 auto;
             }
         }