audio_core: hle: mf: fix a regression...

... where the sample copying logic is incorrect due to the wrong usage
of `std::array`

src/audio_core/hle/adts.h

@@ -16,8 +16,8 @@ struct ADTSData {
     u32 samplerate;
 };
 
-ADTSData ParseADTS(char* buffer);
+ADTSData ParseADTS(const char* buffer);
 
 // last two bytes of MF AAC decoder user data
 // see https://docs.microsoft.com/en-us/windows/desktop/medfound/aac-decoder#example-media-types
-u16 MFGetAACTag(ADTSData input);
+u16 MFGetAACTag(const ADTSData input);