fs.mitm: Make accesses to Boot0 sectored

stratosphere/fs_mitm/source/fsmitm_romstorage.hpp

@@ -31,7 +31,7 @@ class RomFileStorage : public IROStorage {
         RomFileStorage(FsFile f) {
             this->base_file = new FsFile(f);
         };
-        ~RomFileStorage() {
+        virtual ~RomFileStorage() {
             fsFileClose(base_file);
             delete base_file;
         };