Revert "add rounded border"

This reverts commit e40846e4286fbded9cc90baf1f48cd1e67a496a2.

lua/lvim/core/breadcrumbs.lua

@@ -92,9 +92,6 @@ M.config = function()
           ["<ESC>"] = close_all_menus,
           ["q"] = close_all_menus,
         },
-        win_configs = {
-          border = "rounded",
-        },
       },
     },
   }