EXT-7872 FIXED Removed disabling of movement controls when sitting.

- Removed code responsible for disabling actions panel when sitting.

- Removed LLFloaterMove::setEnabled() and replaced calls to it with calls showModeButtons() because it was the only code which remained there after first step of this fix.

Reviewed by Leyla Farazha at https://codereview.productengine.com/secondlife/r/655/

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branch : product-engine