fixes #9406: proper border for justified btn-groups inside tables

dist/css/bootstrap.css

@@ -3872,6 +3872,7 @@ button.close {
 .btn-group-justified {
   display: table;
   width: 100%;
+  border-collapse: separate;
   table-layout: fixed;
 }
 

less/button-groups.less

@@ -229,6 +229,7 @@
   display: table;
   width: 100%;
   table-layout: fixed;
+  border-collapse: separate;
   .btn {
     float: none;
     display: table-cell;