add local variable to keep consistent with the rest of my config

.config/nvim/after/ftplugin/gitcommit.lua

@@ -1,8 +1,10 @@
-vim.opt_local.textwidth = 78
+local o = vim.opt_local
-vim.opt_local.spell = true
+
+o.textwidth = 78
+o.spell = true
 
 return {
    require('cmp').setup.buffer({
       sources = require('cmp').config.sources({ { name = 'gitmoji' } }, { { name = 'buffer' } }),
    }),
-}
+}