Michael Maltese 0767c3d94d DiscIO: add empty UNKNOWN_REGION case (fixes warning)
Fixes warning:

```
dolphin/Source/Core/DiscIO/Enums.cpp:171:11: warning: enumeration value 'UNKNOWN_REGION' not handled in switch [-Wswitch]
  switch (GetSysMenuRegion(title_version))
          ^
```
2017-03-23 20:14:11 -07:00
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