Improved style selection for lists in RTE

[georgegoudie]

Referencing https://our.umbraco.com/documentation/fundamentals/Backoffice/Property-Editors/Built-in-Property-Editors/Rich-Text-Editor/RTE-Styles/

It's possible to create stylesheets to be used by the RTE to apply certain classes, however this doesn't work well with lists. If I specify a list style such as:

/**umb_name:List Secondary*/ ul.list-secondary { }

The RTE does not use the list style properly and outputs multiple ul tags with no li tags inside