fix(format): set formatexpr in options so users can override it. Fixes #1759

lua/lazyvim/config/options.lua

@@ -87,5 +87,7 @@ else
   vim.opt.foldmethod = "indent"
 end
 
+vim.o.formatexpr = "v:lua.require'lazyvim.util'.format.formatexpr()"
+
 -- Fix markdown indentation settings
 vim.g.markdown_recommended_style = 0