show only file extension instead of duplicate filename display

lua/custom/plugins/barbecue.lua

@@ -6,5 +6,9 @@ return {
     'SmiteshP/nvim-navic',
     'nvim-tree/nvim-web-devicons',
   },
-  opts = {},
+  opts = {
+    modifiers = {
+      basename = ':e',
+    },
+  },
 }