Enable WebRTC-ClockAligner by default

Make ClockAligner default to non-monotonic clock alignment, allowing
it to handle backward clock jumps and clock drift unless explicitly
disabled via the field trial 'WebRTC-ClockAligner'.

Rename fix_non_monotonic_clock_ to disable_non_monotonic_clock_fix_
and initialize it using field_trials().IsDisabled("WebRTC-ClockAligner").

Bug: webrtc:555794212
Change-Id: I530cf4e22194c195fde5d6ab5e78b38f1f2c82da
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/506340
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#48751}