[FIX] website: disable overlay on arrows in gallery snippet

Before this commit it was possible to activate the overlay of the
arrows of the gallery snippet (with themes because of animation
options)

task-2312878

closes odoo/odoo#59860

X-original-commit: d74b7618c750724c2efe448c57b07c6d6191e375
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/snippets/s_image_gallery/000.xml

@@ -31,11 +31,11 @@
                 </li>
             </ul>
 
-            <a class="carousel-control-prev" t-attf-href="##{id}" data-slide="prev" aria-label="Previous" title="Previous">
+            <a class="carousel-control-prev o_we_no_overlay" t-attf-href="##{id}" data-slide="prev" aria-label="Previous" title="Previous">
                 <span class="fa fa-chevron-left fa-2x text-white"></span>
                 <span class="sr-only">Previous</span>
             </a>
-            <a class="carousel-control-next" t-attf-href="##{id}" data-slide="next" aria-label="Next" title="Next">
+            <a class="carousel-control-next o_we_no_overlay" t-attf-href="##{id}" data-slide="next" aria-label="Next" title="Next">
                 <span class="fa fa-chevron-right fa-2x text-white"></span>
                 <span class="sr-only">Next</span>
             </a>