Bump default font size to 15 px
Bump default font size to 15 px

Signed-off-by: Marco Ambrosini <3397c7e210a9d1588196cfebb12b2c6b133f6934@pm.me>

nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server