[FIX] rating: improvement for rating image display in kanban

Steps to reproduce:
- install project, studio
- activate ratings for projects and create a kanban view with the rating model
(trough studio)

Previous behavior:
some images in the kanban view are not displayed

Current behavior:
all images are displayed properly

opw-2205549

closes odoo/odoo#48462

X-original-commit: 4b5691dee5a397551ca92a9ac78571ce7f82f276
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/rating/views/rating_rating_views.xml

@@ -68,7 +68,7 @@
                         <t t-name="kanban-box">
                             <div class="oe_kanban_global_click">
                                 <div class="o_kanban_image">
-                                    <img t-attf-src="/rating/static/src/img/rating_#{record.rating.raw_value}.png" t-att-alt="record.rating.name"/>
+                                    <field name="rating_image" widget="image"/>
                                 </div>
                                 <div class="oe_kanban_details">
                                     <strong>