Respect the REGISTER_MANUAL_CONFIRM setting when registering via OIDC (#24035) (#24333)

Backport #24035 by @garymoon

This change prevents Gitea from bypassing the manual approval process
for newly registered users when OIDC is used.

- Resolves https://github.com/go-gitea/gitea/issues/23392

Signed-off-by: Gary Moon <gary@garymoon.net>
Co-authored-by: Gary Moon <garymoon@users.noreply.github.com>

routers/web/auth/oauth.go

@@ -963,7 +963,7 @@ func SignInOAuthCallback(ctx *context.Context) {
 			}
 
 			overwriteDefault := &user_model.CreateUserOverwriteOptions{
-				IsActive: util.OptionalBoolOf(!setting.OAuth2Client.RegisterEmailConfirm),
+				IsActive: util.OptionalBoolOf(!setting.OAuth2Client.RegisterEmailConfirm && !setting.Service.RegisterManualConfirm),
 			}
 
 			source := authSource.Cfg.(*oauth2.Source)