Setting the timer duration to zero panicks

[MWFIAE]

Bevy version

bevy 0.10.1

What you did

I set a repeating timers duration to 0. I did so accidentally using the egui_inspector, but is also reproducible if setting it via code.

What went wrong

Bevy panicked, because it can't divide by 0.

thread 'Compute Task Pool (3)' panicked at 'attempt to divide by zero', C:<redacted>.cargo\registry\src\index.crates.io-6f17d22bba15001f\bevy_time-0.10.1\src\timer.rs:228:21

Caused by this line of code:

                self.times_finished_this_tick =
                    (self.elapsed().as_nanos() / self.duration().as_nanos()) as u32;```

## Additional information

While in my case it happened for a repeating timer, similar panics can and will happen if for example the percent function of the timer is used, while the duration is set to 0.

[MWFIAE]

Also I'm not entirely sure what the expected behaviour would be in a case like that (except it not panicking :) ).

[alice-i-cecile]

I'm not 100% sure what the correct behavior is here either, but it shouldn't be too hard to investigate.