chore: fix bydb config cleanupUnusedTopNRules default value (#13369)

Author: wankai123

oap-server/server-starter/src/main/resources/bydb.yml

@@ -46,7 +46,7 @@ global:
   # If the BanyanDB server is configured with TLS, configure the TLS cert file path and enable TLS connection.
   sslTrustCAPath: ${SW_STORAGE_BANYANDB_SSL_TRUST_CA_PATH:""}
   # Cleanup TopN rules in BanyanDB server that are not configured in the bydb-topn.yml config.
-  cleanupUnusedTopNRules: ${SW_STORAGE_BANYANDB_CLEANUP_UNUSED_TOPN_RULES:false}
+  cleanupUnusedTopNRules: ${SW_STORAGE_BANYANDB_CLEANUP_UNUSED_TOPN_RULES:true}
 
 groups:
   # The group settings of record.