WbfsBlob: Don't wrap file_entry in std::unique_ptr

There doesn't seem to be any reason for doing it.

Source/Core/DiscIO/WbfsBlob.h

@@ -53,7 +53,7 @@ private:
     u64 size;
   };
 
-  std::vector<std::unique_ptr<file_entry>> m_files;
+  std::vector<file_entry> m_files;
 
   u64 m_size;