Fix vp10 highbd psnr calculation

BUG=https://bugs.chromium.org/p/webm/issues/detail?id=1209
Change-Id: Ia189ec4c1cc9bbcb79a45d1904567d943e2b3bb6

vpxenc.c

@@ -2273,7 +2273,8 @@ int main(int argc, const char **argv_) {
     }
 
     if (global.show_psnr) {
-      if (global.codec->fourcc == VP9_FOURCC) {
+      if (global.codec->fourcc == VP9_FOURCC ||
+          global.codec->fourcc == VP10_FOURCC) {
         FOREACH_STREAM(
             show_psnr(stream, (1 << stream->config.cfg.g_input_bit_depth) - 1));
       } else {