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/extractor.cpp

@@ -116,9 +116,6 @@ bool PatchExtractor::cleanup() {
     if (remove(PATCHES_ZIP) != 0)
         cleanupOk_ = false;
 
-    // Cannot delete our own NRO while the app is still running; try anyway for edge cases.
-    remove(SELF_NRO);
-
     remove("sdmc:/switch/.PatchExtractor.nro.star");
     remove("sdmc:/switch/.packages/boot_package.ini");