fix(item): normalize border radius in case browsers change it
fix(item): normalize border radius in case browsers change it

fixes #12912

driftyco/ionic,TillaTheHun0/ionic,driftyco/ionic,driftyco/ionic,driftyco/ionic,TillaTheHun0/ionic,TillaTheHun0/ionic,driftyco/ionic,TillaTheHun0/ionic