Profile photo not being set from external IDP claims

## Describe the bug
After sending the picture claim on the access token, the user profile picture is not set on ocis.
## Steps to reproduce
1.Set up an external IDP and openid-configuration json.
2.Return an access_token with the picture claim from the token_endpoint.
3.Go through your ocis domain and the OIDC flow with your external IDP, once successfully signed in, the user profile picture is not set.

## Expected behavior
The profile picture of the logged in user is shown on the Web UI of ocis.

## Actual behavior
There are letters on the profile circle instead of a photo.

## Setup
1.Setup an external web server and host your openid-configuration.json:
```
{
"issuer": "https://youridp.com",
"authorization_endpoint": "https://youridp.com/auth",
"token_endpoint": "https://youridp.com/api/token",
"userinfo_endpoint": "https://youridp.com/api/userinfo",
"end_session_endpoint": "https://youridp.com",
"response_types_supported": [
"code"
],
"subject_types_supported": [
"public"
],
"id_token_signing_alg_values_supported": [
"PS256"
],
"jwks_uri": "https://youridp.com/.well-known/jwks.json",
"scopes_supported": [
"openid",
"email",
"profile"
],
"code_challenge_methods_supported": [
"S256"
],
"token_endpoint_auth_methods_supported": [
"none"
],
"claims_supported": [
"iss",
"sub",
"aud",
"exp",
"iat",
"name",
"picture",
"family_name",
"given_name",
"email",
"email_verified"
]
}
```
2.Build the OIDC endpoints.
3.Set the claims and return the access and id tokens to you ocis server:
```
const accessTokenPayload = {
iss: youridp,
sub: user.id,
aud: "web",
scp: "profile email openid",
name: user.name,
picture: user.profilePhoto,
email: `${user.email}@example.com`,
preferred_username: user.name
};
...
return res.json({
token_type: "Bearer",
expires_in: 300,
id_token: token,
access_token: accessToken,
});
```
4.Setup your ocis server following the docs https://doc.owncloud.com/ocis/next/deployment/container/container-setup.html
5.Configure ocis to use an external IDP using envs like mentioned here https://github.com/owncloud/ocis/blob/master/deployments/examples/ocis_keycloak/docker-compose.yml