openvpnmsica: Fix TAPInterface.DisplayName field interpretation

openvpnmsica: Fix TAPInterface.DisplayName field interpretation

The DisplayName field type is Filename in the MSI database. This means
it must be authored as "8.3" filename, or "8.3|long filename".

This issue does not appear until interface names grow longer than 8
characters, or contain characters invalid in 8.3 filename notation.

Signed-off-by: Simon Rozman <simon@rozman.si>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20200309131728.380-2-simon@rozman.si>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19520.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>