Log Message:
graphics/lxqt-themes: update to 1.1.0

Main changes:
-New wallpapers are added and all wallpapers are put inside a single directory.
-A new theme is added (Valendas).
-Palettes that match some LXQt themes are added. They can be applied in LXQt
 Appearance Configuration → Widget Style → Qt Palette.
-Several fixes are made in all themes.
-Menu arrows are added for RTL layouts.