lavfi: remove some video w/h settings after avfilter_copy_buffer_ref_props.

video->[wh] will be set with the same values as the input after
avfilter_copy_buffer_ref_props. These filters don't change the size of
the input so there is no need for this code.

libavfilter/vf_delogo.c

@@ -229,11 +229,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
             avfilter_unref_bufferp(&in);
             return AVERROR(ENOMEM);
         }
-
         avfilter_copy_buffer_ref_props(out, in);
-
-        out->video->w = outlink->w;
-        out->video->h = outlink->h;
     }
 
     for (plane = 0; plane < 4 && in->data[plane]; plane++) {

libavfilter/vf_gradfun.c

@@ -198,10 +198,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
             avfilter_unref_bufferp(&in);
             return AVERROR(ENOMEM);
         }
-
         avfilter_copy_buffer_ref_props(out, in);
-        out->video->w = outlink->w;
-        out->video->h = outlink->h;
     }
 
     for (p = 0; p < 4 && in->data[p]; p++) {

libavfilter/vf_hqdn3d.c

@@ -338,10 +338,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
             avfilter_unref_bufferp(&in);
             return AVERROR(ENOMEM);
         }
-
         avfilter_copy_buffer_ref_props(out, in);
-        out->video->w = outlink->w;
-        out->video->h = outlink->h;
     }
 
     for (c = 0; c < 3; c++) {