Fix warning: ambiguous first argument

Author: kamipo

activerecord/test/cases/scoping/relation_scoping_test.rb

@@ -246,7 +246,7 @@ def test_merge_options
         devs = Developer.all
         sql = devs.to_sql
         assert_match "(salary = 80000)", sql
-        assert_match /LIMIT 10|ROWNUM <= 10|FETCH FIRST 10 ROWS ONLY/, sql
+        assert_match(/LIMIT 10|ROWNUM <= 10|FETCH FIRST 10 ROWS ONLY/, sql)
       end
     end
   end