improper function of buttons
improper function of buttons

Half turns should call updateCenters twice, but were called only once.
Closes #37

blonkm/rubiks-cube,minakhan01/RubiksHarmony,minakhan01/RubiksHarmony,minakhan01/RubiksHarmony,blonkm/rubiks-cube,blonkm/rubiks-cube,blonkm/rubiks-cube,minakhan01/RubiksHarmony