clean up remnents of old fingerprint algo

[ryancdotorg]

Description:

Cleans up the now unused compat flag when computing TLS public key fingerprints.

Marked 'draft' until I get around to testing it.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.0.241206
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[s-hadinger]

Thanks

[ryancdotorg]

I've now tested this, and it works fine.

[arendst]

Thx. Merged already.