SpaceAnalyzer: Add separator before quit menu action

Userland/Applications/SpaceAnalyzer/main.cpp

@@ -276,6 +276,7 @@ int main(int argc, char* argv[])
     file_menu.add_action(GUI::Action::create("&Analyze", [&](auto&) {
         analyze(tree, treemapwidget, statusbar);
     }));
+    file_menu.add_separator();
     file_menu.add_action(GUI::CommonActions::make_quit_action([&](auto&) {
         app->quit();
     }));