Fix bug: indent mistake in yamlutil sample config

hieda_yamlutil/default_config_sample.go

@@ -12,7 +12,7 @@ backends:
     level: "INFO"
     # This field should exist for type 'console'
     console_config:
-	  # Should be one of 'stdout', 'stderr'
+      # Should be one of 'stdout', 'stderr'
       to: "stdout"
   local_rotate_file:
     # Should be one of 'console', 'file', 'alisls'