BUG: The new version v0.18.1 brokes the script to make !important on styleable:change

No demo

### Describe the bug

I use the code below to make all styles to !important 

`// Make all styles important to override element classes
            editor.on('styleable:change', (model, property) => {
                const value = String(model.getStyle()[property]);
                if (value.indexOf('!important') === -1) {
                    model.addStyle({ [property]: value + ' !important' });
                }
            });`

I check this solution in this issue :
            
https://github.com/artf/grapesjs/issues/1041#issuecomment-382545102

but after the 1 hour ago update this script doesn't work anymore


   

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