[3.2] Fix ETC quality setting

[madmiraal]

3.2 version of #44682

Note: As stated in #44682, and reproduced here for the benefit of those reading this. This PR leaves the default effort at 0, because the default lossy_quality is 0.7. Therefore there will be no impact to most users. However, anyone using a higher value for the lossy_quality will notice a significant increase in the time it takes to create the VRAM compressed files. As an indication, here are the times in ms I get for importing a 1024x1024 texture to ETC and ETC2 format with this PR:

Lossy Quality	ETC	ETC2
0.7	797	1,452
> 0.75	4,104	9,284
> 0.85	11,419	36,787
> 0.95	44,267	73,894

The benefit of course is that the textures will have the expected higher quality; even if the artificial adjustment to the effort remains.

[akien-mga]

Thanks!