Merge pull request #5648 from FearlessTobi/port-5139

Port yuzu-emu/yuzu#5139: "game_list_p: Resolve deprecated usage of QVariant operator<"

src/citra_qt/game_list_p.h

@@ -274,7 +274,8 @@ public:
     }
 
     bool operator<(const QStandardItem& other) const override {
-        return data(CompatNumberRole) < other.data(CompatNumberRole);
+        return data(CompatNumberRole).value<QString>() <
+               other.data(CompatNumberRole).value<QString>();
     }
 };