updated donate banner JS to account for PNI if needed

[danielfmiranda]

Description

Link to sample test page:

This PR updates the donate banner JS file so the "close" button at the top right corner of the donate banner works on all pages, including PNI.

Steps to test:

1. Visit https://foundation-s-hotfix-pni-wjuhyj.herokuapp.com/en/
2. Note that the Donate Banner is rendering as expected.
3. Click the X button at the top right corner of the donate banner, note that it closes as expected.
4. Open your dev tools and navigate to "local storage". Delete the item with the key "donate banner dismiss day".
5. Visit https://foundation-s-hotfix-pni-wjuhyj.herokuapp.com/en/privacynotincluded/
6. Click the X button at the top right corner of the donate banner, note that it now closes as expected.
7. If everything is working as expected, testing is complete!

┆Issue is synchronized with this Jira Story

[ramram-mf]

Thanks Daniel. Working as expected.

[dlopezvsr]

Tested, worked as expected. LGTM, thanks @danielfmiranda!