DiscIO: Fix NAND Memory Leak

CNANDContentData is a base class with a non-virtual destructor so
derived classes don't get destroyed causing them to leak resources.

Source/Core/DiscIO/NANDContentLoader.cpp

@@ -29,6 +29,8 @@
 
 namespace DiscIO
 {
+CNANDContentData::~CNANDContentData() = default;
+
 CSharedContent::CSharedContent()
 {
   UpdateLocation();

Source/Core/DiscIO/NANDContentLoader.h

@@ -25,6 +25,7 @@ bool AddTicket(u64 title_id, const std::vector<u8>& ticket);
 class CNANDContentData
 {
 public:
+  virtual ~CNANDContentData() = 0;
   virtual void Open(){};
   virtual const std::vector<u8> Get() = 0;
   virtual bool GetRange(u32 start, u32 size, u8* buffer) = 0;