HighResShot with a png output uses 24 bit depth in PIE instead of 32 bit

Tested in 4.27.2 binary which produced 32 bit depth pngs in both the editor and PIE.

Using the HighResShot command to get a png while playing in editor results in a 24 bit depth screenshot where previously it was 32 bit.

1. Open any Project
2. Play in Editor
3. Press ` then enter the command(Replace E with whatever drive you have): HighResShot filename=E:/32Bit_png.png 640x480
4. Browse to the screenshot then right-click and open Properties
5. Navigate to the Details tab

Expected Results:
Bit Depth should be 32, and roughly 400 KB in Size

Actual Results:
Bit Depth is 24 bits, and less than 25 KB in Size