ZUGFeRDService: remove manual cleaning up of log files

Services.ZUGFeRDService/ZUGFeRDService.vb

@@ -18,19 +18,6 @@ Public Class ZUGFeRDService
         _config = New ConfigManager(Of Config)(_logConfig, My.Application.Info.DirectoryPath)
         _logConfig.Debug = _config.Config.Debug
         _logger = _logConfig.GetLogger()
-        Try
-            Dim directory As New IO.DirectoryInfo(_logConfig.LogDirectory)
-
-            For Each file As IO.FileInfo In directory.GetFiles
-                If (Now - file.CreationTime).Days > 29 Then
-                    file.Delete()
-                Else
-                    Exit For
-                End If
-            Next
-        Catch ex As Exception
-
-        End Try
         _logger.Info($"{Constants.SERVICE_NAME} is starting.")
 
         Dim oDataSource As String = _config.Config.Firebird.DataSource