Bump onebox version

- reuse existing video icon class
- CSS changes for reddit video onebox

Gemfile.lock

@@ -241,7 +241,7 @@ GEM
     omniauth-twitter (1.4.0)
       omniauth-oauth (~> 1.1)
       rack
-    onebox (1.9.28)
+    onebox (1.9.28.1)
       addressable (~> 2.7.0)
       htmlentities (~> 4.3)
       multi_json (~> 1.11)

app/assets/stylesheets/common/base/onebox.scss

@@ -276,22 +276,10 @@ aside.onebox {
           '<svg xmlns="http://www.w3.org/2000/svg" width="32px" height="32px" viewBox="0 0 512 512" fill="white"><path d="M424.4 214.7L72.4 6.6C43.8-10.3 0 6.1 0 47.9V464c0 37.5 40.7 60.1 72.4 41.3l352-208c31.4-18.5 31.5-64.1 0-82.6z"></path></svg>'
         );
       }
-      bottom: 10px;
+      bottom: 15px;
       right: 10px;
       position: absolute;
     }
-
-    .reddit-video-icon {
-      &:before {
-        opacity: 0.8;
-        content: svg-uri(
-          '<svg xmlns="http://www.w3.org/2000/svg" width="32px" height="32px" viewBox="0 0 512 512" fill="white"><path d="M424.4 214.7L72.4 6.6C43.8-10.3 0 6.1 0 47.9V464c0 37.5 40.7 60.1 72.4 41.3l352-208c31.4-18.5 31.5-64.1 0-82.6z"></path></svg>'
-        );
-      }
-      bottom: 155px;
-      right: 50px;
-      position: absolute;
-    }
   }
 }
 
@@ -676,6 +664,9 @@ aside.onebox.stackexchange .onebox-body {
 }
 
 .onebox.reddit {
+  div.aspect-image-full-size {
+    position: relative;
+  }
   div.description {
     color: dark-light-choose($primary-medium, $secondary-medium);
     padding-top: 10px;