[FIX] website_slides: Add back the slide type icons in the lists

This commit adds back the slide type icons on the sidebar list
in fullscreen and not fullscreen mode.

Commit linked to task ID 1978530 (fixes linked to internal testing).

addons/website_slides/views/website_slides_templates_lesson.xml

@@ -148,6 +148,9 @@
                             </i>
                         </div>
                         <div class="o_wslides_lesson_link_name">
+                            <t t-call="website_slides.slide_icon">
+                                <t t-set="slide" t-value="aside_slide"/>
+                            </t>
                             <span t-esc="aside_slide.name" class="mr-2"/>
                         </div>
                         <div class="ml-auto" t-if="aside_slide.question_ids">

addons/website_slides/views/website_slides_templates_lesson_fullscreen.xml

@@ -93,6 +93,7 @@
                     <div class="ml-2">
                         <a class="d-block pt-1" href="#">
                             <div class="d-flex ">
+                                <t t-call="website_slides.slide_icon"/>
                                 <div class="o_wslides_fs_slide_name" t-esc="slide.name"/>
                             </div>
                         </a>