GUI: Re-enable the Tools -> Load Wii System Menu option on emulator start. #2574
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This re-enables the Tools -> Load Wii System Menu option on emulator start, which I believe was broken when D_SESSION_WIIROOT_IDX was introduced in dc91e8b. Since that commit, the option was greyed-out when first starting the emulator and was only enabled when a Wii game booted. (UpdateWiiMenuChoice() in FrameTools.cpp uses the regular GetNANDLoader() function, which always uses the session WiiRoot, which was only initialized on game boot.)
I assume it's fine to just initialize it immediately? It'll be re-set in InitializeWiiRoot() anyway.