Fix #132172: studiolight HDRIs have black/negative pixels

The worldspace studiolight HDR images shipped in Blender have some
black/negative pixel artifacts, mostly in the brightest areas. These
are caused by the default downscaling filter that has negative lobes,
last time they were updated/added in e9df155d53. Fix the issue by
downloading already correct resolution (1024x512) from the source,
and recompressing with the same DWA quality setting.

Co-authored-by: Steffen Dünner <steffen.duenner@gmail.com>
Pull Request: https://projects.blender.org/blender/blender/pulls/132220

release/datafiles/studiolights/world/license.txt

@@ -1,3 +1,15 @@
-All HDRIs are licenses as CC0.
+All HDRIs are licensed as CC0.
 
 These were created by Greg Zaal (Poly Haven https://polyhaven.com).
+Originals used for each HDRI:
+- City: https://polyhaven.com/a/portland_landing_pad
+- Courtyard: https://polyhaven.com/a/courtyard
+- Forest: https://polyhaven.com/a/ninomaru_teien
+- Interior: https://polyhaven.com/a/hotel_room
+- Night: Probably https://polyhaven.com/a/moonless_golf
+- Studio: Probably https://polyhaven.com/a/studio_small_01
+- Sunrise: https://polyhaven.com/a/spruit_sunrise
+- Sunset: https://polyhaven.com/a/venice_sunset
+
+1K resolution of each was taken, and compressed with oiiotool:
+oiiotool input.exr --ch R,G,B -d float --compression dwab:300 --clamp:min=0.0:max=32000.0 -o output.exr