Improve timeline-icon CSS

Add float to all timeline icons instead of only
those for system notes

app/assets/stylesheets/pages/notes.scss

@@ -355,10 +355,13 @@ $note-form-margin-left: 72px;
     }
   }
 
+  .timeline-icon {
+    float: left;
+  }
+
   .system-note,
   .discussion-filter-note {
     .timeline-icon {
-      float: left;
       display: flex;
       align-items: center;
       background-color: $white-light;

changelogs/unreleased/31030-when-viewing-comments-occasionally-the-users-profile-picture-will-b.yml

+---
+title: Fix broken notes avatar rendering in Chrome 77
+merge_request: 18110
+author:
+type: fixed