avfilter/vf_libplacebo: strip ICC profiles on CSP change

Not doing so is an obvious oversight - the ICC profile is tied to the
original colorspace, so if we change it, we should definitely strip this
information.

We should probably also have an extra option to control whether the ICC
profile should be stripped, ignored, or applied, but for now this fixes
an existing bug.

libavfilter/vf_libplacebo.c

@@ -535,6 +535,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
     if (changed_csp) {
         av_frame_remove_side_data(out, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA);
         av_frame_remove_side_data(out, AV_FRAME_DATA_CONTENT_LIGHT_LEVEL);
+        av_frame_remove_side_data(out, AV_FRAME_DATA_ICC_PROFILE);
     }
     if (s->apply_dovi || changed_csp) {
         av_frame_remove_side_data(out, AV_FRAME_DATA_DOVI_RPU_BUFFER);