[FIX] web: kanban card focus outline bottom

The kanban card do not display their outline on the bottom side of the
card. This is due to a negative margin (used to compensate for the
border bottom of the card).

This commit removes the border top if the kanban_record as a prior
kanban_record sibling, using its sibling border_bottom as its border
top and getting rid of the negative margin.

task-3488451

closes odoo/odoo#138772

X-original-commit: bf89d4ec951c77f5c7a01ccbad5edf0f7110f706
Signed-off-by: Pierre Paridans (app) <app@odoo.com>

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

@@ -77,7 +77,10 @@
     .o_kanban_record {
         position: relative;
         min-width: 150px;
-        margin: 0 0 (-$border-width);
+
+        & ~ .o_kanban_record .oe_kanban_card {
+            border-top: none;
+        }
 
         > div:not(.o_dropdown_kanban) {
             padding: var(--KanbanRecord-padding-v) var(--KanbanRecord-padding-h);