Fix ANSI escape codes being included in log files on macOS (#1115)

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## Description of change

Before this change, log files written on macOS would include ANSI escape
codes (#1050). It's unclear why this is not reproducible on Linux.

This change reorders the logging layers such that the console layer
(with ANSI) is evaluated last, and so the mutations to add ANSI escapes
is not applied when writing log files. This issue appears related:
tokio-rs/tracing#658.

Relevant issues: #1050 

## Does this change impact existing behavior?

This fixes log files written on macOS (which is an unsupported
platform).

## Does this change need a changelog entry in any of the crates?

This is a minor bug fix on an unsupported platform, so no changelog
entry needed.

---

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license and I agree to the terms of
the [Developer Certificate of Origin
(DCO)](https://developercertificate.org/).

Signed-off-by: Daniel Carl Jones <[email protected]>

mountpoint-s3/src/logging.rs

@@ -159,8 +159,8 @@ fn init_tracing_subscriber(config: LoggingConfig) -> anyhow::Result<()> {
 
     let registry = tracing_subscriber::registry()
         .with(syslog_layer)
-        .with(console_layer)
         .with(file_layer)
+        .with(console_layer)
         .with(metrics_tracing_span_layer());
 
     registry.init();