Change log message about the current working directory

Be more precise about the purpose of the log message. The current
working directory just got changed and the old message is confusing with
`--api-only` mode. Also just treat is a debug message.

Author: bjoernricks

src/gsad.c

@@ -1312,9 +1312,7 @@ chroot_drop_privileges (gboolean do_chroot, const gchar *drop, const gchar *dir)
           g_critical ("failed to change to \"%s\": %s", dir, strerror (errno));
           return 1;
         }
-      g_info ("Serving from directory  %s"
-              "",
-              dir);
+      g_debug ("Working directory is %s", dir);
     }
 
   return 0;