tools/target_dec_fuzzer: Adjust threshold for UTVIDEO

Fixes: Timeout
Fixes: 47969/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_fuzzer-5097256832860160

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

tools/target_dec_fuzzer.c

@@ -281,6 +281,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     case AV_CODEC_ID_TQI:         maxpixels  /= 1024;  break;
     case AV_CODEC_ID_TRUEMOTION2: maxpixels  /= 1024;  break;
     case AV_CODEC_ID_TSCC:        maxpixels  /= 1024;  break;
+    case AV_CODEC_ID_UTVIDEO:     maxpixels  /= 1024;  break;
     case AV_CODEC_ID_VB:          maxpixels  /= 1024;  break;
     case AV_CODEC_ID_VC1:         maxpixels  /= 8192;  break;
     case AV_CODEC_ID_VC1IMAGE:    maxpixels  /= 8192;  break;