Don't force --formatter=plugins on rabbitmq-plugins commands

They already use the correct one.
Per discussion with @hairyhum.

[#160792758]

Author: michaelklishin

scripts/rabbitmq-plugins

@@ -29,4 +29,4 @@ set -a
 # shellcheck source=./rabbitmq-env
 . "${0%/*}"/rabbitmq-env
 
-run_escript rabbitmqctl_escript "${ESCRIPT_DIR:?must be defined}"/rabbitmq-plugins --formatter=plugins -q "$@"
+run_escript rabbitmqctl_escript "${ESCRIPT_DIR:?must be defined}"/rabbitmq-plugins -q "$@"

scripts/rabbitmq-plugins.bat

@@ -56,7 +56,7 @@ if not defined ERL_CRASH_DUMP_SECONDS (
 -nodename !RABBITMQ_NODENAME! ^
 -run escript start ^
 -escript main rabbitmqctl_escript ^
--extra "%RABBITMQ_HOME%\escript\rabbitmq-plugins" --formatter=plugins !STAR!
+-extra "%RABBITMQ_HOME%\escript\rabbitmq-plugins" !STAR!
 
 endlocal
 endlocal