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.cpp

@@ -2,6 +2,14 @@
 
 #include <cstdio>
 
+namespace {
+bool g_deleteSelfOnExit = false;
+}
+
+bool PatchActivity::shouldDeleteSelfOnExit() {
+    return g_deleteSelfOnExit;
+}
+
 PatchActivity::PatchActivity() {
     extractor = std::make_unique<PatchExtractor>();
 
@@ -128,6 +136,7 @@ void PatchActivity::showScreen(Screen screen) {
         break;
 
     case Screen::Done: {
+        g_deleteSelfOnExit = true;
         titleLabel->setText("Fertig");
         const unsigned long ok = extractor->getExtracted() - extractor->getSkipped();
         char msg[128];