Resizing a window with scale factor override of zero panics

## Bevy version and features

0.18.1

## What went wrong

App panics doe to [`.expect`](https://github.com/bevyengine/bevy/blob/v0.18.1/crates/bevy_camera/src/projection.rs#L390) when resizing the window from being a fully expanded to a smaller window with `Window` scale factor override of `Some(0.0)`.

You can get to `Some(0.0)` by having a valid value set in code (in my game it's `.with_scale_factor_override(1.5)`), then modifying the value in editor tooling (egui inspector).

## Additional information

Similar issue https://github.com/bevyengine/bevy/issues/23141.

```
thread 'Compute Task Pool (1)' (1642774) panicked at /home/choc/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/bevy_camera-0.18.1/src/projection.rs:390:14:
Failed to update PerspectiveProjection: width and height must be positive, non-zero values: Infinite
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Encountered a panic in system `bevy_render::camera::camera_system`!
```

## Possible solutions

- Ignore [setting aspect_ratio](https://github.com/bevyengine/bevy/blob/v0.18.1/crates/bevy_camera/src/projection.rs#L389) if a valid `AspectRatio` could not be built.
- Somehow tie this error into using Bevys error handling machinery so it's not a straight panic.

Start in crates/bevy_camera/src/projection.rs around the linked setting of aspect_ratio and inspect how PerspectiveProjection updates during bevy_render::camera::camera_system. Reproduce the resize with Window scale factor override Some(0.0), then compare the behavior with issue 23141. Done means this invalid override no longer causes the application to panic during resizing.

Written by the indexing model from the issue text.