Refactor code to use `eSpaceSeq_Proxy_RenderSize` or corresponding `IMB_Proxy_Size` enum items directly. `SEQ_PROXY_RENDER_SIZE_100` has assigned value 99 to distinguish from `SEQ_PROXY_RENDER_SIZE_FULL`. This caused error in image size calculation and because of that image had to be scaled. Author: EitanSomething Reviewed By: ISS Differential Revision: http://developer.blender.org/D6368