Hide PRB box in checkout block when PRBs disabled (#2337)

* Hide PRB box in checkout block when PRBs disabled, it checks the parent PRB enable/disable setting first

Author: EvanDotPro

includes/class-wc-stripe-blocks-support.php

@@ -185,6 +185,11 @@ private function should_show_payment_request_button() {
 		// TODO: Remove the `function_exists()` check once the minimum WP version has been bumped
 		//       to version 5.0.
 		if ( function_exists( 'has_block' ) ) {
+			// Don't show if PRBs are turned off entirely.
+			if ( ! isset( $this->settings['payment_request'] ) || 'yes' !== $this->settings['payment_request'] ) {
+				return false;
+			}
+
 			// Don't show if PRBs are supposed to be hidden on the cart page.
 			if (
 				has_block( 'woocommerce/cart' )