Resetting the RGB values of a Sky Atmosphere's Absorption

Resetting the RGB values of the Absorption to a Sky Atmosphere using the 'reset to default' arrow still appears after pressed.

Tested in: 4.25 CL#10387577

1. Start a Time of Day level (with the new Sky Atmosphere)
2. Select Sky Atmosphere
3. Change the R/G/B values of the Absorption
4. Click the reset to default button 

Results: Reset arrows still appear after resetting to default values.

Expected: Arrows to not appear.