[FIX] web: kanban: fix cursor blinking on settings column

When the cursor hovers just above the settings icon that appears when
the cursor is in the column is blinking between the pointer and the
"move column" pointer cursor

Task: 2060825

closes odoo/odoo#36377

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/scss/kanban_view.scss

@@ -414,7 +414,6 @@
 
             &:hover .o_kanban_config, .o_kanban_config.show {
                 visibility: visible;
-                margin-left: $o-kanban-inside-hgutter;
             }
 
             .o_kanban_config {