Support both orientations for lightbox. (#805)
Support both orientations for lightbox. (#805)

Fixes: #771
kunall17/zulip-mobile,vishwesh3/zulip-mobile,Sam1301/zulip-mobile,Sam1301/zulip-mobile,nashvail/zulip-mobile,kunall17/zulip-mobile,Sam1301/zulip-mobile,nashvail/zulip-mobile,kunall17/zulip-mobile,Sam1301/zulip-mobile,kunall17/zulip-mobile,nashvail/zulip-mobile,Sam1301/zulip-mobile,Sam1301/zulip-mobile,vishwesh3/zulip-mobile,nashvail/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile