New Admin Theme: InputfieldTinyMCE custom styles should not be overridden

[chriswthomson]

When using the new default admin theme, this should not override custom styles set in InputfieldTinyMCE:

The custom style should take precedence. This may be something on the list to be handled, but wanted to flag it anyway as this would be something that would prevent us from rolling out the new theme on existing sites.