allow overriding :exec-fn when used via clj -M

[mk]

Given the following deps.edn:

{:aliases {:foo {:extra-deps {org.babashka/cli {:mvn/version "0.4.38"}}
                 :exec-fn clojure.core/prn
                 :main-opts ["-m" "babashka.cli.exec"]}}}

I can override the :exec-fn when using clj -X:

mk@studio ~/d/cli-exec-fn> clj -X:foo :my-string '"foo"'
{:my-string "foo"}

mk@studio ~/d/cli-exec-fn> clj -X:foo clojure.core/println :my-string '"foo"'
{:my-string foo}

But not when using babashka.cli via clj -M:

mk@studio ~/d/cli-exec-fn> clj -M:foo --my-string foo
{:my-string "foo"}

mk@studio ~/d/cli-exec-fn> clj -M:foo clojure.core/println --my-string foo
{:my-string "foo"}

It would be nice if this could be supported.

[borkdude]

Fixed in v0.4.39