Fix bug in Adafruit_GFX_Button::contains
Fix bug in Adafruit_GFX_Button::contains

daniel3514/Adafruit-GFX-Library,labsud/Adafruit-GFX-Library,ubidefeo/Adafruit-GFX-Library,sstocker46/Adafruit-GFX-Library,labsud/Adafruit-GFX-Library,bryanmwhite/Adafruit-GFX-Library,venusdharan/Adafruit-GFX-Library,venusdharan/Adafruit-GFX-Library,bryanmwhite/Adafruit-GFX-Library,daniel3514/Adafruit-GFX-Library,ubidefeo/Adafruit-GFX-Library,sstocker46/Adafruit-GFX-Library,jeroavf/Adafruit-GFX-Library,leighmurray/GFX-Sharp,leighmurray/GFX-Sharp,jeroavf/Adafruit-GFX-Library