[FIX] web_editor: prevent link o_default_snippet_text

Whenever a link is being manipulated through the link tool,
the classes are being saved before the manipulation. However,
the class `o_default_snippet_text` is removed in the meantime.

Because we never want that class after the manipulation, this commit
systematically remove it.

Task-2667983

X-original-commit: f82f004e1e1439c38a09d5eb0fded5197e058c1b
Part-of: odoo/odoo#79641

addons/web_editor/static/src/js/wysiwyg/widgets/link.js

@@ -183,6 +183,7 @@ const Link = Widget.extend({
             target: data.isNewWindow ? '_blank' : '',
         });
         if (data.classes) {
+            data.classes = data.classes.replace(/o_default_snippet_text/, '');
             attrs.class = `${data.classes}`;
         }
         if (data.rel) {