When the LFE escriptize command runs, it doesn't compile LFE first

[oubiwann]

The rebar3 LFE compiler doesn't seem to be compiling the LFE app (included in the rebar3.config file to be bundled with the escript). This does not work:

$ rebar3 lfe escriptize

Whereas this does:

$ rebar3 lfe compile
$ rebar3 escriptize

[oubiwann]

This is no longer manifesting, since the documentation says simply to run rebar3 escriptize ... but I think it still needs to be fixed.