Léo Lam 7a1f676ef4 Always use configured root when installing WAD
This prevents Dolphin from writing to /sys/uid.sys (on the host; root
partition) when installing a WAD before starting emulation, because
the session root is not initialized at that moment.

Incidentally, this also gets rid of a singleton.
2017-02-10 19:12:08 +01:00
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