fix rubocop failures

lib/gitlab/email/html_parser.rb

@@ -20,7 +20,10 @@ module Gitlab
       end
 
       def filtered_html
-        @filtered_html ||= (filter_replies!; document.inner_html)
+        @filtered_html ||= begin
+          filter_replies!
+          document.inner_html
+        end
       end
 
       def filtered_text

spec/lib/gitlab/email/reply_parser_spec.rb

@@ -209,7 +209,6 @@ describe Gitlab::Email::ReplyParser, lib: true do
 
     it "properly renders html-only email from MS Outlook" do
       expect(test_parse_body(fixture_file("emails/outlook_html.eml"))).to eq("Microsoft Outlook 2010")
-
     end
   end
 end