Revert "fix: use 'select_account' OIDC prompt to be in line with upstream"

This reverts commit bfc0662.

Author: dervoeti

frontend/src/access_control/auth_provider/oidc.ts

@@ -25,7 +25,6 @@ export const oidcConfig = {
             ? window.__RUNTIME_CONFIG__.OIDC_SCOPE
             : "openid profile email",
     automaticSilentRenew: true,
-    prompt: "select_account",
     onSigninCallback: onSigninCallback,
 };