Update test to not depend on passing named arguments via Herokuish

There may be a bug in Herokuish that messes up with quoted named
arguments, see discussion in
https://github.com/dokku/dokku/pull/2018

tests/apps/nodejs-express/Procfile

@@ -6,7 +6,7 @@
 cron: node worker.js
 web: node web.js
 worker: node worker.js
-console: bash
+custom: echo -n
 
 
 # Old version with separate processes (use this if you have issues with the threaded version)

tests/unit/30_core_1.bats

@@ -130,12 +130,12 @@ build_nginx_config() {
 
 @test "(core) run command from Procfile" {
   deploy_app
-  run /bin/bash -c "dokku run $TEST_APP console -c 'echo hi' | tail -n 1"
+  run /bin/bash -c "dokku run $TEST_APP custom 'hi dokku' | tail -n 1"
   echo "output: "$output
   echo "status: "$status
 
   assert_success
-  assert_output "hi"
+  assert_output 'hi dokku'
 }
 
 @test "(core) port exposure (dockerfile raw port)" {