fix #42,latte icon shown correctly in ksysguard

--shell metadata file was missing the icon, this
fixes also the configuration window icon

app/dockconfigview.cpp

@@ -42,6 +42,10 @@ DockConfigView::DockConfigView(Plasma::Containment *containment, DockView *dockV
       m_blockFocusLost(false),
       m_dockView(dockView)
 {
+    if (containment) {
+        setIcon(QIcon::fromTheme(containment->corona()->kPackage().metadata().iconName()));
+    }
+
     connections << connect(dockView, &QObject::destroyed, this, &QObject::deleteLater);
     m_screenSyncTimer.setSingleShot(true);
     m_screenSyncTimer.setInterval(100);

shell/metadata.desktop.cmake

@@ -5,6 +5,7 @@ Comment=Shell provided for the Latte Dock
 
 Keywords=shell
 Type=Service
+Icon=latte-dock
 
 X-KDE-ServiceTypes=Plasma/Shell
 X-KDE-ParentApp=latte-dock