Face Down Vibrate 1.2

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Turns on vibrate mode when the phone is in face down position. Disables vibrate mode and restores previous sound mode when phone is face up.
This is a new improved version. It uses two decision blocks to create a flip-flop effect. This improves error handling, avoids race conditions, and sets the mode more accurately.
Latest improvement does not change the mode if it is already silent or vibrate.
Uses total 7 blocks.