[clang-format] Fix comparison warning in 32-bit builds (#172627)
In our 32-bit Arm builds we see:
```
UnwrappedLineFormatter.cpp:645:31: warning: comparison of integers of different signs: 'typename iterator_traits<AnnotatedLine *const *>::difference_type' (aka 'int') and 'const unsigned int' [-Wsign-compare]
645 | if (std::distance(I, E) <= N)
| ~~~~~~~~~~~~~~~~~~~ ^ ~
```
The existing comparison seems to assume that the distance will not be
negative. So to fix this warning I've cast the distance to the unsigned
type.
I think this warning does not occur in 64-bit builds because there it is
safe to extend the unsigned 32-bit integer to the 64-bit signed distance
type.
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