FPS overlay flashing red

## Bevy version and features
Bevy 0.17.2 default features

## Relevant system information
cargo 1.88.0 (873a06493 2025-05-10)
stable-aarch64-apple-darwin
Darwin MacBook-Pro.local 25.0.0 Darwin Kernel Version 25.0.0: Wed Sep 17 21:41:45 PDT 2025; root:xnu-12377.1.9~141/RELEASE_ARM64_T6000 arm64
M1 Macbook (aarch64)

```ignore
`SystemInfo { os: "macOS 26.0.1", kernel: "25.0.0", cpu: "Apple M1 Pro", core_count: "10", memory: "16.0 GiB"`
`AdapterInfo { name: "Apple M1 Pro", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }`
```

## What you did
Added the `FpsOverlayPlugin::default()` to my game

## What went wrong
Frame time area flashes red consistently when having poor FPS. Expected only the portion of the bar that represents the current frame time to be red.

## Additional information

https://github.com/user-attachments/assets/ec244095-9d1b-48f6-9d4b-08f9ad9801fb