`--dirs-first` flag does nothing if no SortType is specified

[fawni]

for example: et --dirs-first will not sort directories above files, but if sort type is specified: et --dirs-first -s name it works as expected.

i was able to produce the expected behavior by adding a None enum variant to SortType and adding:

} else if ctx.dirs_first() {
	Order::from((SortType::None, true))
		.comparator()
		.map(|func| current_node.sort_children(func));
}

to this line, but there are probably "cleaner" approaches.

also, i noticed that clippy suggests a bunch of stylistic refactors all over. do you have an opinion against such stylistic approaches?

[solidiquis]

I do not, but if you plan to open a PR if you could pass on running clippy that'd be awesome. Someone has another PR that's currently waiting to be merged and they ran clippy and I'd be worried about really gnarly merge conflicts that could cause headaches. Thanks for looking into this btw!