tools/target_dec_fuzzer: Adjust threshold for AASC

Fixes: Timeout
Fixes: 47919/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AASC_fuzzer-5176435830030336

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

@@ -208,6 +208,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     maxpixels = maxpixels_per_frame * maxiteration;
     maxsamples = maxsamples_per_frame * maxiteration;
     switch (c->p.id) {
+    case AV_CODEC_ID_AASC:        maxpixels  /= 1024;  break;
     case AV_CODEC_ID_AGM:         maxpixels  /= 1024;  break;
     case AV_CODEC_ID_ANM:         maxpixels  /= 1024;  break;
     case AV_CODEC_ID_ARBC:        maxpixels  /= 1024;  break;