IOS/ESFormats: Remove unused TMDReader function

The ES function that used to make use of it was changed to be more
sane, so GetRawHeader() is now unused and useless.

Source/Core/Core/IOS/ES/Formats.cpp

@@ -192,11 +192,6 @@ bool TMDReader::IsValid() const
   return true;
 }
 
-std::vector<u8> TMDReader::GetRawHeader() const
-{
-  return std::vector<u8>(m_bytes.begin(), m_bytes.begin() + sizeof(TMDHeader));
-}
-
 std::vector<u8> TMDReader::GetRawView() const
 {
   // Base fields

Source/Core/Core/IOS/ES/Formats.h

@@ -179,7 +179,6 @@ public:
   bool IsValid() const;
 
   // Returns parts of the TMD without any kind of parsing. Intended for use by ES.
-  std::vector<u8> GetRawHeader() const;
   std::vector<u8> GetRawView() const;
 
   u16 GetBootIndex() const;