fix: use correct app when testing scaling of non-existent process types

tests/unit/10_ps-dockerfile.bats

@@ -78,7 +78,7 @@ teardown() {
 
   destroy_app
   create_app
-  deploy_app dockerfile
+  deploy_app dockerfile-procfile
   run bash -c "dokku --trace ps:scale $TEST_APP non-existent=2"
   echo "output: $output"
   echo "status: $status"