style: Replace unnecessary map_or
#1221
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Fixes clippy lints like this:
```
warning: this `map_or` is redundant
--> prost-build/src/ast.rs:104:9
|
104 | / chars
105 | | .next()
106 | | .map_or(false, |c| c != ' ' || chars.next() == Some(' '))
| |_____________________________________________________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
= note: `#[warn(clippy::unnecessary_map_or)]` on by default
```
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Fixes clippy lints like this: