modified detection

• 500268tenable_ot_siemens_CVE-2019-6568.nasl • 1.13
• 502217tenable_ot_siemens_CVE-2023-45898.nasl • 1.4
• 502223tenable_ot_siemens_CVE-2023-48795.nasl • 1.3
• 502219tenable_ot_siemens_CVE-2023-5678.nasl • 1.4
• 502220tenable_ot_siemens_CVE-2023-6121.nasl • 1.4
• 502221tenable_ot_siemens_CVE-2023-6817.nasl • 1.4
• 502218tenable_ot_siemens_CVE-2023-6931.nasl • 1.4
• 502216tenable_ot_siemens_CVE-2023-6932.nasl • 1.4