various: allow setting footage aspect ratios

We had support for detecting aspect ratios and respecting them in the
render, but this allows people to not only see the aspect ratio in use,
but also override it with their own.

app/render/backend/opengl/openglproxy.cpp

@@ -149,7 +149,7 @@ QVariant OpenGLProxy::FrameToValue(FramePtr frame, StreamPtr stream, const Video
     VideoParams frame_params = frame->video_params();
 
     // Check frame aspect ratio
-    if (frame->sample_aspect_ratio() != 1 && frame->sample_aspect_ratio() != 0) {
+    if (frame->sample_aspect_ratio() != 1) {
       int new_width = frame_params.width();
       int new_height = frame_params.height();