fixes #4221: correct border-collapse property for IE7 hack

docs/assets/css/bootstrap.css

@@ -1781,7 +1781,7 @@ table {
 .table-bordered {
   border: 1px solid #dddddd;
   border-collapse: separate;
-  *border-collapse: collapsed;
+  *border-collapse: collapse;
   border-left: 0;
   -webkit-border-radius: 4px;
      -moz-border-radius: 4px;

less/tables.less

@@ -79,7 +79,7 @@ table {
 .table-bordered {
   border: 1px solid @tableBorder;
   border-collapse: separate; // Done so we can round those corners!
-  *border-collapse: collapsed; // IE7 can't round corners anyway
+  *border-collapse: collapse; // IE7 can't round corners anyway
   border-left: 0;
   .border-radius(4px);
   th,