GooglePay Express button is not being rendered in minicart

[rge-dS]

Describe the bug
GooglePay Express button is not being initialised in the minicart because required configuration variables are missing.

To Reproduce
Steps to reproduce the behavior:

1. Add product to cart
2. Open minicart
3. Do not see Googlepay Button

Expected behavior
adyenExpressMetadata.isml is missing the following window variables, which are present in adyenComponentForm.isml

window.merchantAccount = "${AdyenConfigs.getAdyenMerchantAccount()}";
window.googleMerchantID = "${AdyenConfigs.getGoogleMerchantID()}";

Desktop (please complete the following information):

• OS: Windows
• Browser: chrome
• Version: 150.0.7871.115