collector raises Configuration error if we use CLF to forward logs to default output and and loki is the default store.

Steps to Reproduce:
1. use loki as default storage.

apiVersion: "logging.openshift.io/v1"
kind: "ClusterLogging"
metadata:
  name: "instance"
  namespace: openshift-logging
spec:
  managementState: "Managed"
  logStore:
    type: "lokistack"
    lokistack:
    name: lokistack-sample
  collection:
    type: "vector"

2. use CLF to manage pipeline

apiVersion: logging.openshift.io/v1
kind: ClusterLogForwarder
metadata:
  name: instance
  namespace: openshift-logging
spec:
  pipelines:
    name: all-to-defaultES
    inputRefs:
    - infrastructure
    - application
    - audit
   outputRefs:
   - default

Actual result:
oc logs pod/collector-575nm -c collector
2022-07-27T09:07:10.199007Z INFO vector::app: Log level is enabled. level="info"
2022-07-27T09:07:10.199092Z INFO vector::app: Loading configs. paths=["/etc/vector/vector.toml"]
2022-07-27T09:07:10.210016Z ERROR vector::cli: Configuration error. error=Sink "default_infra" has no inputs