test(button): fix karma tests for the new button syntax
test(button): fix karma tests for the new button syntax

dennybiasiolli/ionic,manucorporat/ionic,cambronjay/ionic,alan-agius4/ionic,AbraaoAlves/ionic,cambronjay/ionic,cambronjay/ionic,AbraaoAlves/ionic,manucorporat/ionic,driftyco/ionic,driftyco/ionic,jhlee8804/ionic,manucorporat/ionic,jhlee8804/ionic,alan-agius4/ionic,TillaTheHun0/ionic,AbraaoAlves/ionic,jhlee8804/ionic,driftyco/ionic,alan-agius4/ionic,driftyco/ionic,cambronjay/ionic,brianespinosa/ionic2-sass,dennybiasiolli/ionic,dennybiasiolli/ionic,TillaTheHun0/ionic,joshesp/ionic,alan-agius4/ionic,alan-agius4/ionic,TillaTheHun0/ionic,manucorporat/ionic,dennybiasiolli/ionic,jhlee8804/ionic,joshesp/ionic,cambronjay/ionic,joshesp/ionic,dennybiasiolli/ionic,jhlee8804/ionic,joshesp/ionic,alan-agius4/ionic,AbraaoAlves/ionic,TillaTheHun0/ionic,AbraaoAlves/ionic,manucorporat/ionic,driftyco/ionic