Avoid double scroll-bars in control box

css/converse.css

@@ -941,7 +941,7 @@ dl.add-converse-contact {
   margin: 0.5em 0 0 0;
   height: 194px;
   height: calc(100% - 68px);
-  overflow-x: hidden;
+  overflow: hidden;
 }
 #converse-roster .roster-filter {
   padding: 0;

less/converse.less

@@ -1050,7 +1050,7 @@ dl.add-converse-contact {
     margin: 0.5em 0 0 0;
     height: 194px;
     height: ~"calc(100% - 68px)";
-    overflow-x: hidden;
+    overflow: hidden;
 }
 
 #converse-roster .roster-filter {