Detail component should not initial the width (18px) by default, if the theme is not in classic-blue

For example in Detail.java

public Detail() {
setWidth("18px");
}

It should not assume the width of the icon to be 18px, for example, in breeze the width is greater than 18px.
To fix it is to use a Javascript function to return the width of the component, and override it when using different theme. (but we may ignore the returned width, if component's width has specified)