Consider refreshing the LibreOffice icons for the 7.5 release

Hi! Thanks for theming LibreOffice! The 7.5 release (to be released in February 2023) will feature a [new](https://wiki.documentfoundation.org/images/archive/6/68/20221214145913%21NewAppMimeIcons.png) [design](https://github.com/LibreOffice/core/tree/master/sysui/desktop/icons/hicolor) for the main app icons. Please consider refreshing them in the Luv style :)