fix: formatexpr uses the same options as conform.format() (#837)

* Make formatexpr use the same option as conform.format()

* Update lua/conform/init.lua

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

Author: xulongwu4

lua/conform/init.lua

@@ -832,10 +832,8 @@ M.get_formatter_info = function(formatter, bufnr)
 end
 
 M.formatexpr = function(opts)
-  -- Change the defaults slightly from conform.format
+  -- Use the same defaults as conform.format(), but force async = false and handle the range
   opts = vim.tbl_deep_extend("keep", opts or {}, {
-    timeout_ms = 500,
-    lsp_format = "fallback",
     bufnr = vim.api.nvim_get_current_buf(),
   })
   -- Force async = false