improve config file (#154)

- Added and enabled by default the necessary settings for a fast sync.
- Removed the deprecated `on_close_redeem_single_tickets_value_min` setting.

hoprd.cfg.yaml

@@ -14,7 +14,6 @@ hopr:
         aggregate_on_channel_close: true
       - !AutoRedeeming
         redeem_only_aggregated: true
-        on_close_redeem_single_tickets_value_min: "90000000000000000 HOPR"
         minimum_redeem_ticket_value: "30000000000000000000 HOPR"
       - !ClosureFinalizer
         max_closure_overdue: 3600
@@ -38,6 +37,8 @@ hopr:
     announce: true
     check_unrealized_balance: true
     network: dufour
+    keep_logs: true
+    fast_sync: true
   safe_module:
     safe_transaction_service_provider: https://safe-transaction.prod.hoprtech.net/
   transport: