refactor(appearance): remove the unused background visibility

clients/appearance/appearance.cpp

@@ -26,7 +26,7 @@ Appearance::Appearance()
     }
     for (const char* member : {"darkModeChanged", "darkModeScheduleChanged", "wallpaperChanged",
                                "userWallpapersChanged", "wallpaperFoldersChanged", "continuousCornersChanged",
-                               "backgroundVisibleChanged", "accentColorChanged", "backgroundTypeChanged",
+                               "accentColorChanged", "backgroundTypeChanged",
                                "backgroundColorChanged", "cursorThemeChanged", "cursorSizeChanged",
                                "iconThemeChanged", "systemFontPointSizeChanged", "systemFontChanged"}) {
         m_matches.push_back(m_service.onSignal(member, [this](const dbus::Message&) { reload(); }));
@@ -256,9 +256,4 @@ void Appearance::setBackgroundColor(const std::string& color)
     m_service.send("setBackgroundColor", color);
 }
 
-bool Appearance::backgroundVisible() const
-{
-    return value<bool>("backgroundVisible", true);
-}
-
 } // namespace cutefish::appearance

clients/appearance/appearance.h

@@ -78,7 +78,6 @@ public:
     // "#RRGGBB".
     std::string backgroundColor() const;
     void setBackgroundColor(const std::string& color);
-    bool backgroundVisible() const;
 
     // After any value changed, or the service came or went.
     base::Signal<> changed;