[Fix] ensure --help is intercepted on any command

Co-authored-by: Naomi Quinones <52065567+naomiquinones@users.noreply.github.com>
Co-authored-by: Dena Burd <me@Denas-MacBook-Air.local>

test/fast/Unit tests/nvm_check_for_help

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+die () { echo "$@" ; exit 1; }
+
+\. ../../../nvm.sh
+
+TERM=dumb nvm clear-cache --help | grep 'Usage:' || die 'did not print help menu'
+TERM=dumb nvm cache help version | grep 'Usage:' || die 'did not print help menu'
+TERM=dumb nvm cache -h version| grep 'Usage:' || die 'did not print help menu'