Bring system icon into XDG compliance

(cherry picked from commit 02b39de86e)

src/dolphin.cpp

@@ -1104,7 +1104,7 @@ void Dolphin::init()
     KBookmarkGroup root = manager->root();
     if (root.first().isNull()) {
         root.addBookmark(manager, i18n("Home"), settings.homeURL(), "folder_home");
-        root.addBookmark(manager, i18n("System"), KURL("system:/"), "system");
+        root.addBookmark(manager, i18n("System"), KURL("system:/"), "computer");
         root.addBookmark(manager, i18n("Storage Media"), KURL("system:/media"), "blockdevice");
         root.addBookmark(manager, i18n("Network"), KURL("remote:/"), "network_local");
         root.addBookmark(manager, i18n("Users' Folders"), KURL("system:/users"), "folder_home2");