* fix isFeatureCameraActive for spec
ace_spectator_camera was removed in 77c2b99ee5 .
spectator module initializes three separate cameras instead, of which for example ace_spectator_freeCamera can be used to check if spec mode is active
* use ace_spectator_isSet to check for spec mode
The function is currently only used by ace_goggles and it makes sense to expand it to detect if any common feature camera is active rather than just BI cameras
