No need to re-specify default escript_shebang in rebar.config

rebar.config

@@ -2,7 +2,6 @@
 %% ex: ts=4 sw=4 ft=erlang et
 
 {app_bin, ["priv/rebar"]}.
-{escript_shebang, "#!/usr/bin/env escript\n"}.
 {escript_emu_args, "%%! -noshell -noinput\n"}.
 %% escript_incl_extra is for internal rebar-private use only.
 %% Do not use outside rebar. Config interface is not stable.