TLS: wrong TLS version in alert after ClientHello

[SparkiDev]

Description

Ignore protocol version being less than expected when received directly after ClientHello. Protocol version negotiation hasn't taken place and a lower version can be sent to cover minimum supported protocol version.

Fixes zd#18099

Testing

./tests/unit.test -test_tls_alert_no_server_hello

Checklist

• [x] added tests
• [ ] updated/added doxygen
• [ ] updated appropriate READMEs
• [ ] Updated manual and documentation