Fix -Wtautological-constant-compare in test/fuzzers.
Fix -Wtautological-constant-compare in test/fuzzers.

This started to be detected by a new version of clang and it is blocking
the roll:

../../third_party/webrtc/test/fuzzers/agc_fuzzer.cc:85:29: error: converting the result of '?:' with integer constants to a boolean always evaluates to 'true' [-Werror,-Wtautological-constant-compare]
const bool num_channels = fuzz_data->ReadOrDefaultValue(true) ? 2 : 1;

Bug: chromium:1007367
Change-Id: Ib9a6e4e3c8f109d10845a315dd0782b1498cb54e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/155166
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Reviewed-by: Nico Weber <c0f02d98506190746d1cdcb01be0f37b51e27077@chromium.org>
Reviewed-by: Sam Zackrisson <b1a93beadfe1d2f7f0106ee02b6ffcdc950aa103@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29348}

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