cleanup: rubocop: fix Layout/IndentHeredoc in Redmine::UnifiedDiffTest#test_one_line_new_files

git-svn-id: http://svn.redmine.org/redmine/trunk@18973 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/lib/redmine/unified_diff_test.rb

@@ -139,7 +139,7 @@ DIFF
   end
 
   def test_one_line_new_files
-    diff = Redmine::UnifiedDiff.new(<<-DIFF
+    diff = Redmine::UnifiedDiff.new(<<~DIFF)
       diff -r 000000000000 -r ea98b14f75f0 README1
       --- /dev/null
       +++ b/README1
@@ -165,7 +165,6 @@ diff -r 000000000000 -r ea98b14f75f0 README4
       +test5
       +test6
     DIFF
-    )
     assert_equal 4, diff.size
     assert_equal "README1", diff[0].file_name
   end