Modifying EDSDKTypes.h unnecessary

[anna-st-40]

The latest version of EDSDK already has the enum definition Unknown in all caps (UNKNOWN) as the readme suggests, so it seems to be redundant to instruct to change it.

[spacedcake]

It's been changed again to:

typedef enum
{
    kEdsImageType_Unknown       = 0x00000000,
    kEdsImageType_Jpeg          = 0x00000001,
    kEdsImageType_CRW           = 0x00000002,
    kEdsImageType_RAW           = 0x00000004,
    kEdsImageType_CR2           = 0x00000006,
    kEdsImageType_HEIF          = 0x00000008,

} EdsImageType;