If scanLogsToKeep is <= 0 don't purge.

For now this would be a manual database update to configure this.
It does help future proof the setting being set in the UI.

server/managers/LogManager.js

@@ -41,6 +41,8 @@ class LogManager {
   }
 
   async enforceDailyLogRetention() {
+    if (this.loggerDailyLogsToKeep <= 0) return
+
     while (this.dailyLogFiles.length > this.loggerDailyLogsToKeep) {
       await this.removeLogFile(this.dailyLogFiles[0])
     }
@@ -197,6 +199,7 @@ class LogManager {
    */
   async purgeOldScanLogs(logDir = this.ScanLogPath) {
     const scanLogsToKeep = this.loggerScannerLogsToKeep
+    if (scanLogsToKeep <= 0) return
 
     let scanFiles
     try {