Style/Lambda incorrectly autocorrects multiline lambdas in keyword arguments

[metcalf]

Expected behavior

Given:

foo bar: ->(x) do
  x * 2
end

Rubocop should either not autocorrect, or wrap the autocorrected lambda in parentheses:

foo fr: (lambda do |x|
  x * 2
end)

Actual behavior

Corrects to:

foo fr: lambda do |x|
  x * 2
end

Steps to reproduce the problem

PR with tests forthcoming.

RuboCop version

Currently broken on master.