[FIX] web_kanban: do not word-wrap counter tags in kanban columns

Because of the fix in commit 4fbecc35e1,
and the newly added word-break for oe_tag class, the kanban column
counter gets split in multiple lines for folded kanban columns,
resulting in

"
9
9
+
"

instead of "99+".

addons/web_kanban/static/src/css/kanban.css

@@ -34,6 +34,7 @@
     .openerp .oe_kanban_view .oe_kanban_group_length .oe_tag {
       position: relative;
       top: 8px;
+      word-break: normal;
       font-weight: bold; }
   .openerp .oe_kanban_view .oe_kanban_header:hover .oe_kanban_group_length {
     display: none; }