avutil/parseutils: use quadhd for Quad HD

qHD is 960x540 (q stands for quarter) and QHD is 2560x1440 (Q is quad).
use quadhd for QHD for abbreviation.

Fix ticket#9591
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

libavutil/parseutils.c

@@ -112,7 +112,7 @@ static const VideoSizeAbbr video_size_abbrs[] = {
     { "hd480",     852, 480 },
     { "hd720",    1280, 720 },
     { "hd1080",   1920,1080 },
-    { "qhd",      2560,1440 },
+    { "quadhd",   2560,1440 },
     { "2k",       2048,1080 }, /* Digital Cinema System Specification */
     { "2kdci",    2048,1080 },
     { "2kflat",   1998,1080 },