Adds ASCII log option needed by portudino (#4443)

* Adds ASCII logs useful to portudino

Activates ASCII log option when stdout is not a terminal.  This is
generally the right thing to do; if not, the behavior can be
overridden in config.yaml using AsciiLogs under Logging.  The result
is reasonable system logs for portudino when running under systemd or
the like.

Signed-off-by: Christopher Hoover <ch@murgatroid.com>

bin/config-dist.yaml

@@ -145,6 +145,7 @@ Input:
 Logging:
   LogLevel: info # debug, info, warn, error
 #  TraceFile: /var/log/meshtasticd.json
+#  AsciiLogs: true     # default if not specified is !isatty() on stdout
 
 Webserver:
 #  Port: 443 # Port for Webserver & Webservices
@@ -152,4 +153,4 @@ Webserver:
 
 General:
   MaxNodes: 200
-  MaxMessageQueue: 100
+  MaxMessageQueue: 100