Link decorators don't handle a case where two decorators apply classes

[Reinmar]

📝 Provide detailed reproduction steps (if any)

This should work fine:

				isGallery: {
					mode: 'manual',
					label: 'Gallery link',
					attributes: {
						class: 'gallery'
					}
				},
				isWhatever: {
					mode: 'manual',
					label: 'Whatever link',
					attributes: {
						class: 'whatever'
					}
				}

But it does not.

getData() outputs the right thing:

<p>sdf <a class="gallery whatever" href="">sdf ds</a></p>

But setData() loses these attributes.

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[Reinmar]

Most likely, the same thing is true also for styles.

From ckeditor/ckeditor5-link#258 on the same will be true for decorators which are truth by default (see https://github.com/ckeditor/ckeditor5-link/pull/258/files#r404808327).

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