fix: default value for logfile rotation interval

The unit of 'd' is not a valid time.Duration unit. Due to the more
strict parsing of durations, this is now correctly failing. Previously
using a value of '1d' would fail silently. If a user wishes to use a
value of days, they need to convert to hours and use '24h' for example
of one day.

Fixes: #10882

etc/telegraf.conf

@@ -89,7 +89,7 @@
   ## The logfile will be rotated after the time interval specified.  When set
   ## to 0 no time based rotation is performed.  Logs are rotated only when
   ## written to, if there is no log activity rotation may be delayed.
-  # logfile_rotation_interval = "0d"
+  # logfile_rotation_interval = "0h"
 
   ## The logfile will be rotated when it becomes larger than the specified
   ## size.  When set to 0 no size based rotation is performed.