fdo#74584: These tags should be lowercase for correct clipboard handling.

Change-Id: I323b96cecbf7158919fad534a202f158965ca99f
(cherry picked from commit 88c6cbda921f1e3627910f9028ff2e29f26160e7)
Reviewed-on: https://gerrit.libreoffice.org/8154
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>