Issue 6432 - Hide remove button for additional filter lists

skin/desktop-options.css

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1179 matching lines @@
 #all-filter-lists-table button[role="checkbox"][aria-checked="false"] + .state #state-disabled
 {
   display: inline;
 }
 
 #all-filter-lists-table
 {
   margin-bottom: 0.8rem;
 }
 
+#all-filter-lists-table .non-removable [data-action="remove-subscription"]
+{
+  display: none;
+}
+
 #custom-filters-raw
 {
   width: 100%;
   height: 23.6rem;
   padding: 0.8rem; 
 }
 
 #custom-filters-raw:focus
 {
   outline: none;
@@ skipping 351 matching lines @@
   font-size: 1rem;
   color: #077CA6;
   background-color: #E1F2FA;
 }
 
 #notification strong
 {
   flex: 1;
   text-align: center;
 }