Fix files.h return values enum
Windows visual diff and merge for files and directories
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In files.h there is a en enum for files function return values. The enum defines several "main" return values and one "modifier". The idea has been that return value is a combination of main value + modifier.
However, there are several "main" values that really should be main + modifier combinations, like FRESULT_OK_IMPURE should be OK main + IMPURE modifier.