Fix RuboCop 0.40 linter errors (#1722)

These errors are breaking the build, which seems to use RuboCop 0.40 [1]
despite the Gemfile.lock pinning rubocop to 0.38.

New lints that I am updating the code style to reflect:

- Style/EmptyCaseCondition: Do not use empty case condition, instead use
  an if expression.

- Style/MultilineArrayBraceLayout: Closing array brace must be on the
  same line as the last array element when opening brace is on the same
  line as the first array element.

- Style/MultilineHashBraceLayout: Closing hash brace must be on the same
  line as the last hash element when opening brace is on the same line
  as the first hash element.

- Style/MultilineMethodCallBraceLayout: Closing method call brace must
  be on the line after the last argument when opening brace is on a
  separate line from the first argument.

[1] https://github.com/bbatsov/rubocop/releases/tag/v0.40.0

test/adapter/json_api/pagination_links_test.rb

@@ -43,7 +43,8 @@ module ActiveModelSerializers
         end
 
         def data
-          { data: [
+          {
+            data: [
               { id: '1', type: 'profiles', attributes: { name: 'Name 1', description: 'Description 1' } },
               { id: '2', type: 'profiles', attributes: { name: 'Name 2', description: 'Description 2' } },
               { id: '3', type: 'profiles', attributes: { name: 'Name 3', description: 'Description 3' } },