(dev/core#4414) Greenwich - Fix icon path

[totten]

Overview

This fixes an issue where the Greenwich Bootstrap files include an invalid reference to their font data.

https://lab.civicrm.org/dev/core/-/issues/4414

ping @agileware-justin

Before

If you use (e.g.) Mosaico's "New Mailing", then browser console shows a failed request for

http://dmaster.127.0.0.1.nip.io:8001/sites/all/modules/civicrm/ext/greenwich/fonts/glyphicons-halflings-regular.woff2

Visually, on the third tab ("Options"), this button is malformed:

After

In the same use-case, the browser makes a successful request for

http://dmaster.127.0.0.1.nip.io:8001/sites/all/modules/civicrm/ext/greenwich/extern/bootstrap3/assets/fonts/bootstrap/glyphicons-halflings-regular.woff2

The button is OK.

Technical Details

To apply the patch, one needs to:

1. Use the included update for _greenwich.scss
2. Re-run composer compile (or composer install)
3. (For D9+) Re-run composer civicrm:publish

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[agileware-justin]

Thanks @totten looks correct to me.

[seamuslee001]

I'm going to merge based on @agileware-justin feedback