incorrect Style/SoleNestedConditional fix

[modosc]

Style/SoleNestedConditional generates incorrect ruby when fixing this:

unless foo.to_s == "foo"
  if foo.index("_foo")
    return foo
  end
end

---

Expected behavior

if foo.to_s != "foo" && foo.index("_foo")
  return foo
end

Actual behavior

if !foo.to_s == "foo" && foo.index("_foo")
  return foo
end

Steps to reproduce the problem

RuboCop version

1.13.0 (using Parser 3.0.1.0, rubocop-ast 1.4.1, running on ruby 2.7.2 x86_64-darwin20)
  - rubocop-performance 1.10.2
  - rubocop-rails 2.9.1