file_sys/submission_package: Don't warn about missing DeltaFragment NCAs

DeltaFragments are not useful to us and are often not included in patch NSPs.

src/core/file_sys/submission_package.cpp

@@ -248,10 +248,13 @@ void NSP::ReadNCAs(const std::vector<VirtualFile>& files) {
                 auto next_file = pfs->GetFile(fmt::format("{}.nca", id_string));
 
                 if (next_file == nullptr) {
+                    if (rec.type != ContentRecordType::DeltaFragment) {
                         LOG_WARNING(Service_FS,
                                     "NCA with ID {}.nca is listed in content metadata, but cannot "
                                     "be found in PFS. NSP appears to be corrupted.",
                                     id_string);
+                    }
+
                     continue;
                 }