MDL-84295 core_theme: Fix margin for activity description list

* Make sure lists in activity descriptions are displayed
identically on course page and activity pages

theme/boost/scss/moodle/course.scss

@@ -1537,6 +1537,10 @@ $divider-hover-color: $primary !default;
             padding-top: map-get($spacers, 2);
             border-top: $border-width solid $border-color;
             @include font-size($small-font-size);
+            // Fix activity description bottom margin for first level-lists.
+            ul:not(.activity-description ul ul) {
+                margin-bottom: 1rem;
+            }
         }
         // Add rounded borders to images.
         img {

theme/boost/style/moodle.css

@@ -29806,6 +29806,9 @@ span.editinstructions .alert-link {
   border-top: 1px solid #dee2e6;
   font-size: 0.875em;
 }
+.activity-item .activity-altcontent.activity-description ul:not(.activity-description ul ul) {
+  margin-bottom: 1rem;
+}
 .activity-item .activity-altcontent img {
   border-radius: 1rem;
 }

theme/classic/style/moodle.css

@@ -29806,6 +29806,9 @@ span.editinstructions .alert-link {
   border-top: 1px solid #dee2e6;
   font-size: 0.875em;
 }
+.activity-item .activity-altcontent.activity-description ul:not(.activity-description ul ul) {
+  margin-bottom: 1rem;
+}
 .activity-item .activity-altcontent img {
   border-radius: 1rem;
 }