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improve FlxPieDial demo #217

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Run time

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Job	Run time
build (4.2.5, html5)	17m 12s
build (4.2.5, hl)	19m 55s
build (4.2.5, flash)	13m 44s
build (4.2.5, cpp)	19m 29s
build (4.3.4, html5)	15m 10s
build (4.3.4, hl)	24m 35s
build (4.3.4, flash)	14m 10s
build (4.3.4, cpp)	19m 52s
	2h 24m 7s