Git commits in Moodle 3.7.x by Ferran Recio

commit 190216f8a928962680b1d112528ec783905b8a0d
Author: Ferran Recio <ferran@moodle.com>
Date:   Wed, 11 Dec 2019 23:55:03 +0800
Tag:    v3.7.4

MDL-67154 theme_classic: fixing firefox printing

commit 91ff19fc500b038734fada920708bf6a07d3aea6
Author: Ferran Recio <ferran@moodle.com>
Date:   Tue, 03 Dec 2019 21:07:15 +0800
Tag:    v3.7.4

MDL-67154 theme_boost: fixing firefox printing