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

Author: dervoeti

frontend/src/access_control/auth_provider/oidc.ts

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