submission_package: Ensure the 'extracted' member variable is always initialized

If an error occurs when constructing the PartitionFilesystem instance,
the constructor would be exited early, which wouldn't initialize the
extracted data member, making it possible for other code to perform an
uninitialized read by calling the public IsExtractedType() member
function. This prevents that.

src/core/file_sys/submission_package.cpp

@@ -61,8 +61,6 @@ NSP::NSP(VirtualFile file_)
         return;
     }
 
-    extracted = false;
-
     SetTicketKeys(files);
     ReadNCAs(files);
 }