Fix self-delete to run only after successful extraction (v1.1.1).

Only remove PatchExtractor.nro on exit when the Done screen was reached;
early quit no longer deletes the NRO. Drop the ineffective mid-run self-delete.

source/patch_activity.hpp

@@ -13,6 +13,9 @@ public:
     brls::View* createContentView() override;
     void onContentAvailable() override;
 
+    /** True only after a finished extraction (Done screen was reached). */
+    static bool shouldDeleteSelfOnExit();
+
 private:
     enum class Screen { Error, Ready, Extracting, Done };