[FIX] packaging: remove useless soft links

The Debian package is replacing some fonts by a soft link to the Debian
packaged ones.

The glyphicons-halfings were for bootstrap 3.x which is not used anymore
in Odoo, resulting in harmless broken links in the Debian package.

Closes odoo/docker#453

closes odoo/odoo#125796

X-original-commit: bcc68143
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>