As long as the diverter on the spout is down (given the diverter is on the spout) the water will always drain through the spout when the water is off and air will displace the piping going up to the shower head. The dripping could be water that gets trapped in the head itself that for whatever reason doesn't drain down to the spout when the water is shut off. Try shutting off the water with the water diverted to the shower head, then once the water stops push down the diverter. The water should drain from the head out the spout leaving nothing but air.
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