[FIX] web: kanban: quick create column text wrapped

In kanban view, the columns are in a flex container and as there is no
specific flex rules on the quick create column and is shrink by
default. So when the new column is above the edge of the viewport, it
starts to shrink.

To avoid this bug we have added the same flex rules has the kanban
column.

Steps to reproduce:
* Open Note
* Create many new column => BUG text wrapped when the new column reach
  the width of the viewport.

closes odoo/odoo#106549

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

addons/web/static/src/views/kanban/kanban_column_quick_create.xml

@@ -2,7 +2,7 @@
 <templates xml:space="preserve">
 
     <t t-name="web.KanbanColumnQuickCreate" owl="1">
-        <div class="o_column_quick_create" t-ref="root">
+        <div class="o_column_quick_create flex-shrink-0 flex-grow-1 flex-md-grow-0" t-ref="root">
             <div t-if="props.folded" class="o_quick_create_folded m-3 text-nowrap fw-bold opacity-75 opacity-100-hover" t-on-click="unfold">
                 <button class="o_kanban_add_column btn btn-outline-secondary w-100">
                     <i class="fa fa-plus me-2" role="img" aria-label="Add column" title="Add column"/><t t-out="props.groupByFieldString"/>