feat(sass): add hover and active states for avatar upload dialog buttons
feat(sass): add hover and active states for avatar upload dialog buttons

vladikoff/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,vladikoff/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,swatilk/fxa-content-server,swatilk/fxa-content-server,vladikoff/fxa-content-server,shane-tomlinson/fxa-content-server,swatilk/fxa-content-server