[riskiq/malpedia] use logger of OpenCTIConnectorHelper for clients

[axelfahy]

Proposed changes

• Use the logging methods of the OpenCTIConnectorHelper in the clients class instead of instanciating another logger.

Related issues

• n/a

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality using different use cases
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments