Commit d50d3f2734 allowed the use of both bump and normal maps when
using Node Wrangler's Principled Setup. However it made those textures
use the default color space instead of Non-Color, which should be used
for data maps.
The bug was introduced because bump and normal maps were handled as
part of regular textures, for which the Non-Color space is assigned
based on name. The change led to them being extracted to their own
block, but the color space assignment was omitted.
