cleanup duplicated code

Author: yougotwill

browser/components/RealtimeNotification.styl

@@ -53,16 +53,6 @@ body[data-theme="monokai"]
     &:hover
       color #5CB85C
 
-body[data-theme="monokai"]
-  .notification-area
-    background-color none
-
-  .notification-link
-    color $ui-monokai-text-color
-    border none
-    background-color $ui-monokai-button-backgroundColor
-    &:hover
-      color #5CB85C
 body[data-theme="dracula"]
   .notification-area
     background-color none