Fix unneeded left margin discussion filter container

MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/54379

app/assets/stylesheets/pages/notes.scss

@@ -907,14 +907,6 @@ $system-note-svg-size: 16px;
 .discussion-filter-container {
   .dropdown-menu {
     margin-bottom: $gl-padding-4;
-
-    @include media-breakpoint-down(md) {
-      margin-left: $btn-side-margin + $contextual-sidebar-collapsed-width;
-    }
-
-    @include media-breakpoint-down(xs) {
-      margin-left: $btn-side-margin;
-    }
   }
 }
 

changelogs/unreleased/fix-unneeded-left-margin-discussion-filter-container.yml

+---
+title: Fix unneeded left margin in discussion filter container on mobile
+merge_request: 54379
+author:
+type: fixed