fix(ibl): use default hl groups

lua/lazyvim/plugins/ui.lua

@@ -168,10 +168,7 @@ return {
     "lukas-reineke/indent-blankline.nvim",
     event = { "BufReadPost", "BufNewFile" },
     opts = {
-      indent = {
-        char = "│",
-        highlight = "IndentBlanklineChar",
-      },
+      indent = { char = "│" },
       scope = { enabled = false },
       exclude = {
         filetypes = {