Related to EXT-1655 ([BSI] Always flying after pressing "Stand" to stand up...

Related to EXT-1655 ([BSI] Always flying after pressing "Stand" to stand up from an object) - disabled forcing of flying at autopilot stops (for "Sit" autopilot behavior).
Reviewed by Tofu Linden at https://codereview.productengine.com/secondlife/r/253/

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branch : product-engine