Previously it was setting the `averageBitRate` value to what is being set in Variable Bitrate rate control mode. However, CQVBR is initialized with a value of `0` and instead Target Quality is being used. This adds a check for the CQVBR mode and if it's set will update the `targetQuality` value, otherwise it will update `averageBitRate`.
Additionally reset `averageBitRate` to 0 if CQVBR is active, and reset `targetQuality` to 0 if it's not in any VBR mode
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