[FIX] web_editor: also remove img animate class when cleaning attributes

There is a code in charge of removing image animation attributes, but
this code was not removing the `o_animate_on_hover` class.

Probably not that big of a deal but during the investigation of a bug,
this class was not removed while the attributes where, which seems to
lead to a crash later.

Related to commit https://github.com/odoo/odoo/commit/7f730f81ec541cc7791fc6b3fded17c838433f85

Part-of: odoo/odoo#146732

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -7216,6 +7216,7 @@ registry.ImageTools = ImageHandlerOption.extend({
                 delete img.dataset.hoverEffectColor;
                 delete img.dataset.hoverEffectStrokeWidth;
                 delete img.dataset.hoverEffectIntensity;
+                img.classList.remove("o_animate_on_hover");
                 return;
             }
             if (img.dataset.mimetype !== "image/svg+xml") {