fix idp config generation

[butonic]

We now use the OCIS_URL to generate the web client registration configuration. It does not make sense use the OCIS_ISSUER_URL if the idp was configured to run on a different domain.

the client config is correct:

			{
				ID:      "web",
				Name:    "ownCloud Web app",
				Trusted: true,
				RedirectURIs: []string{
					"{{OCIS_URL}}/",
					"{{OCIS_URL}}/oidc-callback.html",
					"{{OCIS_URL}}/oidc-silent-redirect.html",
				},
				Origins: []string{
					"{{OCIS_URL}}",
				},
			},

but we use the wrong variable to replace OCIS_URL

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud