display_filter_lv_vsync fix for the 100D

Created originally on Bitbucket by Dannephoto (danne)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

https://www.magiclantern.fm/forum/index.php?topic=16040.msg202389#msg202389 Defishing Anamorphic Clear overlays framing etc...