chore: revert back config file

Author: LashaJini

clients/cmd/promtail/promtail-local-config.yaml

@@ -1,13 +1,9 @@
 server:
   http_listen_port: 9080
   grpc_listen_port: 0
-  log_level: debug
 
 positions:
   filename: /tmp/positions.yaml
-  sync_period: 10s
-target_config:
-  sync_period: 10s
 
 clients:
   - url: http://localhost:3100/loki/api/v1/push