Merge #3699

3699: [WebGL] Return only RGBA swapchain formats r=kvark a=Gordon-F

WebGL doesn't supports BGRA texture formats

PR checklist:
- [ ] `make` succeeds (on *nix)
- [ ] `make reftests` succeeds
- [x] tested examples with the following backends: WebGL


Co-authored-by: Igor Shaposhnik <Gordon-F@users.noreply.github.com>

src/backend/gl/src/window/web.rs

@@ -111,7 +111,7 @@ pub struct Surface {
 
 impl Surface {
  fn swapchain_formats(&self) -> Vec<f::Format> {
- vec![f::Format::Rgba8Unorm, f::Format::Bgra8Unorm]
+ vec![f::Format::Rgba8Srgb, f::Format::Rgba8Unorm]
  }
 
  pub(crate) unsafe fn present(