Remove disabled legacy code in ffplay.

The code was setting aspect ratio from the DTG active format, and was
present and disabled since the creation of ffplay.

See thread:
Subject: [FFmpeg-devel] [PATCH] Cosmetics: adopt compact notation in
        disabled code.
Date: Sat, 12 Feb 2011 18:46:19 +0100
Signed-off-by: NMans Rullgard <mans@mansr.com>
(cherry picked from commit b7ec5cc4)

ffplay.c

@@ -710,40 +710,6 @@ static void video_image_display(VideoState *is)
         if (aspect_ratio <= 0.0)
             aspect_ratio = 1.0;
         aspect_ratio *= (float)vp->width / (float)vp->height;
-        /* if an active format is indicated, then it overrides the
-           mpeg format */
-#if 0
-        if (is->video_st->codec->dtg_active_format != is->dtg_active_format) {
-            is->dtg_active_format = is->video_st->codec->dtg_active_format;
-            printf("dtg_active_format=%d\n", is->dtg_active_format);
-        }
-#endif
-#if 0
-        switch(is->video_st->codec->dtg_active_format) {
-        case FF_DTG_AFD_SAME:
-        default:
-            /* nothing to do */
-            break;
-        case FF_DTG_AFD_4_3:
-            aspect_ratio = 4.0 / 3.0;
-            break;
-        case FF_DTG_AFD_16_9:
-            aspect_ratio = 16.0 / 9.0;
-            break;
-        case FF_DTG_AFD_14_9:
-            aspect_ratio = 14.0 / 9.0;
-            break;
-        case FF_DTG_AFD_4_3_SP_14_9:
-            aspect_ratio = 14.0 / 9.0;
-            break;
-        case FF_DTG_AFD_16_9_SP_14_9:
-            aspect_ratio = 14.0 / 9.0;
-            break;
-        case FF_DTG_AFD_SP_4_3:
-            aspect_ratio = 4.0 / 3.0;
-            break;
-        }
-#endif
 
         if (is->subtitle_st)
         {