Use 16px as the default icon size instead of 32px
Currently, the SVG Previewer uses 32px
as the selected icon size on load, but since the icons are designed in a 16px
grid, and that is their most common size in the UI, the default state can reflect that.
Current
![Screen_Shot_2019-09-30_at_9.46.21_AM](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)