UI: Update icons after the latest changes in the generator script

There should be no visible change. The difference is mostly on how we
changed the rounding to handle the conversion from color space to the
new linear space of the attribute colors.

To convert the materials in icon_geom.blend I used:

```
import bpy
from mathutils import Color

def convert_material(material):
  if not material.use_nodes:
    return

  if not material.node_tree:
    return

  node_tree = material.node_tree
  for node in node_tree.nodes:
    if node.type != 'RGB':
      continue

      color_original = node.outputs[0].default_value
      color_new = Color(color_original[:3]).from_srgb_to_scene_linear()
      color = (*color_new, color_original[3])
      node.outputs[0].default_value = color

def main():
  for material in bpy.data.materials:
    convert_material(material)

main()
```

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