Add ensure to reset table name in tests

Author: carlosantoniodasilva

activerecord/test/cases/insert_all_test.rb

@@ -819,6 +819,7 @@ def test_insert_all_when_table_name_contains_database
       assert_nothing_raised do
         Book.insert_all! [{ name: "Rework", author_id: 1 }]
       end
+    ensure
       Book.table_name = "books"
     end
   end