Removing unused `feature_flags` key from connection info data.

[message-dimke]

Changes proposed in this Pull Request:

Removing unused connection info data feature_flags key. Does not affect anything since tracking switch is stored at another options key, and CAPI feature flag is not used anywhere.

Changelog entry

Tweak - Remove feature_flag connection info data key.

[budzanowski]

Is this good to go?

[message-dimke]

Hey, @budzanowski , it is!