lavfi/frei0r: Remove duplicated pix_fmt entry

Fixes e.g. 'ffmpeg -i input.mp4 -vf frei0r=pixeliz0r output.mp4':

    [Parsed_frei0r_0 @ 0x5585b8093280] Duplicated pixel format
    Error reinitializing filters!
    Failed to inject frame into filter network: Invalid argument
    Error while processing the decoded data for stream #0:0
    Conversion failed!

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavfilter/vf_frei0r.c

@@ -338,7 +338,7 @@ static int query_formats(AVFilterContext *ctx)
             return ret;
     } else {                                   /* F0R_COLOR_MODEL_PACKED32 */
         static const enum AVPixelFormat pix_fmts[] = {
-            AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_ARGB, AV_PIX_FMT_NONE
+            AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_NONE
         };
         formats = ff_make_format_list(pix_fmts);
     }