relx: do not discard command line parameters when parameter is not in…

[sg2342]

… config

fix #2967

[sg2342]

the very verbose add_or_replace_all_instances/3 could be replaced with
[{Opt, V} | [X || X <- Acc, element(1, X) =/= Opt]]

[joaohf]

Hi,

Is there any update related to tests: https://github.com/erlang/rebar3/blob/main/apps/rebar/test/rebar_release_SUITE.erl I did not check with there is already test for this.

Thanks.