hostedcluster oauth could not work

Config OAuth with htpasswd in the hostedcluster doesn't work as expected.

enable OAuth htpasswd in hostedcluster

1. create passwd file for user init by htpasswd
```
htpasswd -cbB .passwd helitest helitest

oc create secret generic testuser --from-file=htpasswd=.passwd  -n clusters ``` 

2. edit hostedcluster.yaml
```
spec:
  configuration:
    oauth:
      identityProviders:
      - htpasswd:
          fileData:
            name: testuser
        mappingMethod: claim
        name: htpasswd
        type: HTPasswd
```
3. oc login hostedcluster apiserver

$ oc login https://ac0be21b169ff4399b6a2044388c38cf-5789e1b174d7424b.elb.us-east-2.amazonaws.com:6443 --username=testuser --password=testuser
The server uses a certificate signed by an unknown authority.
You can bypass the certificate check, but any data you send to the server could be intercepted by others.
Use insecure connections? (y/n): y


Login failed (401 Unauthorized) 

oc login with error : "Login failed (401 Unauthorized) "

oc login successfully.

# check configmap of oauth 
$ oc get cm -n clusters-demo-02 oauth-openshift -oyaml
...
    oauthConfig:
      alwaysShowProviderSelection: false
      assetPublicURL: ""
      grantConfig:
        method: deny
        serviceAccountMethod: prompt
      identityProviders: []
      loginURL: https://ac0be21b169ff4399b6a2044388c38cf-5789e1b174d7424b.elb.us-east-2.amazonaws.com:6443
      
---> seems `identityProviders` is not synced correctly ?