socketio: always display animated icons in case of socketio problems

On slow browser, the icon was not animated. The animation is quite light
and could be enabled on all browsers. Otherwise, the icon looks
unhelpful and may be missed.

app/styles/receiver/connecting.less

@@ -36,21 +36,16 @@
 
     &:before {
         height: 19.2px;
+        animation: timer-loader 1250ms infinite linear;
     }
 
     &:after {
         height: 16px;
+        animation: timer-loader 15000ms infinite linear;
     }
 
     &.show {
         display: inline-block;
     }
 
-    .dk-fast-browser &:before {
-        animation: timer-loader 1250ms infinite linear;
-    }
-    .dk-fast-browser &:after {
-        animation: timer-loader 15000ms infinite linear;
-    }
-
 }