Update LimeSurvey and UUFruityTheme

LimeSurvey has been updated with the latest security update to help keep the platform secure and up to date.

As part of this update, UU Fruity is now the default theme. This theme is required to use the new survey editor.

If you are still using the old editor, you can change the theme yourself. Go to General → Theme, select UUFruityTheme, and save your changes.