Delete `supervisor` config for `filestat_exporter`.

cookbooks/prometheus-exporters/files/etc/supervisor/conf.d/filestat_exporter.conf

@@ -1,8 +0,0 @@
-[program:filestat_exporter]
-command=/usr/local/bin/filestat_exporter --config.file=/etc/prometheus_exporters.d/filestat.yml
-stdout_logfile=/var/log/supervisor/filestat_exporter.log
-redirect_stderr=true
-stdout_logfile_maxbytes=1MB
-stdout_logfile_backups=5
-autorestart=true
-stopsignal=HUP