Indent multiline bracketed expr with minimal amount of space

[brandonchinn178]

Supercedes #1101

AFAICT, the only motivation for BracketStyle is to prevent the closing bracket from being in the same column as the opening bracket, which can be a parse error in certain contexts, like case patterns. So this only needs to indent by a single space, not a full indentation.

It's not that big of an issue here (1 vs 2 spaces), but it's a bigger issue with larger indentations. So I had to make this fix in Fourmolu anyway, but I'm opening this PR just in case you want to merge it upstream. IMO this encodes the intention better, but I recognize that the breakage might not be worthwhile

[mrkkrp]

In my head, a code snippet is correctly indented iff all its lines start at columns that are divisible by the indentation step. I can see why it looks weird in Fourmolu with larger indentation, but Ormolu does not have that problem and so this change seems unnecessary.

[brandonchinn178]

@mrkkrp Understood. FWIW, there is at least one example where Ormolu does not indent along multiples of 2:

ormolu/data/examples/declaration/value/function/required-type-arguments-out.hs

Lines 16 to 21 in d90413c

	foo =
	f
	( type ( Maybe
	Int
	)
	)

But I understand your point in general. I'll close this PR