[FIX] web: kanban_card border top

In commit `2495bfa7259dcbd482b10c95a55313f86d594fcb` we introduce a fix
to adapt the kanban_card border using the border bottom of the prior
kanban_card as a border top allowing to display the outline effect.

This fix works for o_kanban_grouped but breaks the border in views that
are o_kanban_ungrouped. This commit fixes this by removing the
border-top only in the o_kanban_record that are o_kanban_grouped.

The :not(o_dragged) has been added as well to bring back the border when
the element is dragged.

task-3488451

closes odoo/odoo#139453

X-original-commit: 2be67ee122546273d12710c1c9bc3b7e11533b5d
Signed-off-by: Pierre Paridans (app) <app@odoo.com>

addons/web/static/src/views/kanban/kanban_controller.scss

@@ -78,10 +78,6 @@
         position: relative;
         min-width: 150px;
 
-        & ~ .o_kanban_record .oe_kanban_card {
-            border-top: none;
-        }
-
         > div:not(.o_dropdown_kanban) {
             padding: var(--KanbanRecord-padding-v) var(--KanbanRecord-padding-h);
             width: 100%;
@@ -488,6 +484,10 @@
 
         .o_kanban_record {
             width: 100%;
+
+            & + .o_kanban_record:not(.o_dragged) .oe_kanban_card {
+                border-top: none;
+            }
         }
 
         .o_kanban_group {