Minimising panics again

[DJMcNab]

Bevy version

main, as of at least 2abf5cc (#3153)

Operating system & version

Windows 10

What you did

Ran any example (say cargo run --example 3d_scene), then pressed minimise

What you expected to happen

The window should be minised

What actually happened

The example panics specifically at

bevy/crates/bevy_pbr/src/light.rs

Line 233 in 9a16a4d

Clusters::new((screen_size + UVec2::ONE) / n_tiles, screen_size, Z_SLICES)

because (at least one, but in this case both) of the components of n_tiles are 0.

Additional information

Related issues #2866, #899, #2018, #170, #1882.

We should also add a CI check that minimising works sensibly, if possible.