replace console with Log in calendar debug.js (#3846)

to avoid exception in eslint config.

Background: If someone has a copy of the `modules` folder in his setup
eslint fails because the file `debug.js` uses `console` statements. I
need the `modules` folder renamed in my docker setup so this test always
fails. I think this is a simple solution which has no impact.

eslint.config.mjs

@@ -88,7 +88,6 @@ export default defineConfig([
 		files: ["**/*.js"],
 		ignores: [
 			"clientonly/index.js",
-			"modules/default/calendar/debug.js",
 			"js/logger.js",
 			"tests/**/*.js"
 		],