[nvim] cleanup: remove unused function

.config/nvim/lua/plugin/cmp.lua

@@ -7,10 +7,6 @@ local cmp = require("cmp")
 local luasnip = require("luasnip")
 local cmp_autopairs = require('nvim-autopairs.completion.cmp')
 
-local t = function(str)
-        return vim.api.nvim_replace_termcodes(str, true, true, true)
-end
-
 local check_backspace = function()
         local line, col = unpack(vim.api.nvim_win_get_cursor(0))
         return col ~= 0 and