change: add enable/disable to resources

TIL that zip resource packs, when disabled, actually have the effect of
not showing up in the game at all. Since this can be useful to someone,
I moved the logic for it to the resources.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/pages/instance/ModFolderPage.h

@@ -58,11 +58,6 @@ class ModFolderPage : public ExternalResourcesPage {
    public slots:
     bool onSelectionChanged(const QModelIndex& current, const QModelIndex& previous) override;
 
-    void itemActivated(const QModelIndex& index) override;
-
-    void enableItem() override;
-    void disableItem() override;
-
    private slots:
     void installMods();
     void updateMods();