[fix #3356] Update .editorconfig to default to 2 spaces.
[fix #3356] Update .editorconfig to default to 2 spaces.

mozilla/kitsune,anushbmx/kitsune,mozilla/kitsune,mozilla/kitsune,mozilla/kitsune,anushbmx/kitsune,anushbmx/kitsune,anushbmx/kitsune