Fix "ejabberdctl iexlive" after "make prod" when using Elixir

The version number in ejabberd is 24.02,
but Elixir requires semver, that is, 24.2.
Use the version() function, which does the conversion.

mix.exs

@@ -264,7 +264,7 @@ defmodule Ejabberd.MixProject do
       config_dir: config(:config_dir),
       logs_dir: config(:logs_dir),
       spool_dir: config(:spool_dir),
-      vsn: config(:vsn),
+      vsn: version(),
       iexpath: config(:iexpath),
       erl: config(:erl),
       epmd: config(:epmd),