Adding class names to fieldset
Adding class names to fieldset

Added ccm-attribute, ccm-attribute-select class names to wrapping fieldset. https://github.com/concrete5/concrete5-5.7.0/issues/2262

Former-commit-id: 5312e1b823134cdda35d81ce920ef654d465f3a6
Former-commit-id: ef45f96bf5c059edd324cd9242f1edf3a7d7ef2e
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