fix: replace table.unpack with direct indexing for Neovim 0.12 compat

lua/options.lua

@@ -7,7 +7,6 @@ G.opt.rnu          = true
 G.opt.scrolloff    = 999
 
 -- 自动保存
-G.opt.autowrite    = true
 G.opt.autowriteall = true
 
 -- tab键

lua/plugs/nvim-cmp.lua

@@ -18,8 +18,8 @@ return {
     },
     config = function()
       local has_words_before = function()
-        local unpack = table.unpack
-        local line, col = unpack(G.api.nvim_win_get_cursor(0))
+        local cursor = G.api.nvim_win_get_cursor(0)
+        local line, col = cursor[1], cursor[2]
         return col ~= 0 and G.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match('%s') == nil
       end