style: Use DoubleEndedIterator::next_back - #1255
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Prevents clippy warnings like:
```
warning: called `Iterator::last` on a `DoubleEndedIterator`; this will needlessly iterate the entire iterator
--> prost-build/src/code_generator.rs:473:54
|
473 | .and_then(|ty| ty.split('.').last())
| ^^^^^^ help: try: `next_back()`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_ended_iterator_last
= note: `#[warn(clippy::double_ended_iterator_last)]` on by default
```
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Prevents clippy warnings like: