fix(label): remove flex-basis to fix floating/stacked labels on iOS/Safari
fix(label): remove flex-basis to fix floating/stacked labels on iOS/Safari

fixes #6109

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