fix(tabs): move border to top for windows positioned bottom tabs
fix(tabs): move border to top for windows positioned bottom tabs

fixes #6526

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