NetEq fuzzer: lower the maximum fuzzer input size

This avoids timeouts on the server.

Bug: chromium:935089
Change-Id: I8b46664a7cf4d5f14a76b5d034a67453e730eb9e
Reviewed-on: https://webrtc-review.googlesource.com/c/124484
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26940}

test/fuzzers/neteq_signal_fuzzer.cc

@@ -148,7 +148,7 @@ bool MapHas(const std::map<int, T>& m, int key, const T& value) {
 }  // namespace
 
 void FuzzOneInputTest(const uint8_t* data, size_t size) {
-  if (size < 1 || size > 90000) {
+  if (size < 1 || size > 70000) {
     return;
   }