bnc#887230: always use theme color for hyperlinks in Impress

Change-Id: I888f107c61037162439ad2d1ba99ad8185532f71
(cherry picked from commit 92f74f6ccb5a55807724db85815f7ea0c49370e0)
Reviewed-on: https://gerrit.libreoffice.org/10383
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>