Volumetric fog broken on WASM

## Bevy version

Release: 0.14.0

## Relevant system information

- OS: Linux/X11
- Browser: Firefox and Chrome
- `AdapterInfo { name: "NVIDIA GeForce GTX 980, or similar", vendor: 4318, device: 0, device_type: Other, driver: "WebGL", driver_info: "2.0", backend: Gl }`

You should also consider testing the examples of our upstream dependencies to help isolate any setup-specific issue:

## What you did

Opened the volumetric fog example at: https://bevyengine.org/examples/3d-rendering/volumetric-fog/

## What went wrong

The example looks broken, and an error shows up in the console:
```
panicked at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/glow-0.13.1/src/web_sys.rs:3184:9:
Tex storage 2D multisample is not supported
```

## Additional information


Start by reproducing the volumetric fog example in Firefox and Chrome on WASM, then inspect the reported glow-0.13.1 web_sys.rs:3184:9 failure and the example's rendering setup. Compare the failing multisample behavior with the example's expected configuration. Done means the example renders without the console panic in the reported browsers.

Written by the indexing model from the issue text.