Enable clipsToBounds on cancel button.
Enable clipsToBounds on cancel button.

Fixes #19.

fastred/AHKActionSheet,ChetanGandhi/AHKActionSheet,AlexanderMazaletskiy/AHKActionSheet,puvanarajan/AHKActionSheet,shenhzou654321/AHKActionSheet,lucoceano/AHKActionSheet