Remove excess border between the tab in new plans page top switch (#8121)

GitOrigin-RevId: 5dcd86bd8c0437678b37670c557fa18f266745bb

services/web/frontend/stylesheets/app/plans-v2.less

@@ -17,15 +17,20 @@
   justify-content: center;
 
   li {
-    border: solid 1px @ol-blue-gray-3;
+    border-top: 1px solid @ol-blue-gray-3;
+    border-bottom: 1px solid @ol-blue-gray-3;
     height: @plans-v2-top-switch-item-height;
 
     &.plans-v2-top-switch-individual {
+      border-right: 1px solid @ol-blue-gray-3;
+      border-left: 1px solid @ol-blue-gray-3;
       border-top-left-radius: @plans-v2-top-switch-item-border-radius;
       border-bottom-left-radius: @plans-v2-top-switch-item-border-radius;
     }
 
     &.plans-v2-top-switch-student {
+      border-right: 1px solid @ol-blue-gray-3;
+      border-left: 1px solid @ol-blue-gray-3;
       border-top-right-radius: @plans-v2-top-switch-item-border-radius;
       border-bottom-right-radius: @plans-v2-top-switch-item-border-radius;
     }