Set Style/TrailingCommaInArguments's EnforcedStyleForMultiline to comma

Differently from the Hash and Array versions of this rule, this one
uses the existence of parentheses to determine if a comma is needed
or not, not if the method is multiline. As our style guide require
parentheses for all method calls, so this rule can't use the
consistent_comma option.

rubocop.yml

@@ -709,7 +709,7 @@ Style/TrailingBodyOnMethodDefinition:
  Enabled: false
 
 Style/TrailingCommaInArguments:
- EnforcedStyleForMultiline: consistent_comma
+ EnforcedStyleForMultiline: comma
 
 Style/TrailingCommaInArrayLiteral:
  EnforcedStyleForMultiline: consistent_comma

test/config_test.rb

@@ -17,7 +17,7 @@ def test_config_is_unchanged
  Rake::Task["config:dump"].invoke(tempfile.path)
 
  diff = Diffy::Diff.new(
- original_config, tempfile.path, source: "files", context: 5,
+ original_config, tempfile.path, source: "files", context: 5
  ).to_s
 
  error_message = <<~ERROR

test/fixtures/full_config.yml

@@ -3887,7 +3887,7 @@ Style/TrailingCommaInArguments:
  StyleGuide: "#no-trailing-params-comma"
  Enabled: true
  VersionAdded: '0.36'
- EnforcedStyleForMultiline: consistent_comma
+ EnforcedStyleForMultiline: comma
  SupportedStylesForMultiline:
  - comma
  - consistent_comma