Ignore WebRTC-VP9-SvcForSimulcast in fuzzers

The field trial is just a kill-switch and is enabled by default.
No need to test with and without it.

Bug: chromium:371233788
Change-Id: I1b21670761284d974319aa7adaa3af60863b23ad
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/364780
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Auto-Submit: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43177}
diff --git a/test/fuzzers/vp9_encoder_references_fuzzer.cc b/test/fuzzers/vp9_encoder_references_fuzzer.cc
index cf80ccf..c39b896 100644
--- a/test/fuzzers/vp9_encoder_references_fuzzer.cc
+++ b/test/fuzzers/vp9_encoder_references_fuzzer.cc
@@ -208,7 +208,8 @@
         key == "WebRTC-GetEncoderInfoOverride" ||
         key == "WebRTC-VP9-GetEncoderInfoOverride" ||
         key == "WebRTC-VP9-PerformanceFlags" ||
-        key == "WebRTC-VP9QualityScaler") {
+        key == "WebRTC-VP9QualityScaler" ||
+        key == "WebRTC-VP9-SvcForSimulcast") {
       return "";
     }