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Fixes an empty Mods page.
The mod provider was initialized with the catalog root mods, but it looks
for <root>/packages and the build stages mods/preloaded/packages. It
found no packages, returned success — an empty catalog is legal — and the
Mods page rendered empty with no error logged anywhere. The packages were in
the v0.6.3 zip the whole time; nothing loaded them.
Widescreen and MSU-1 audio are both back.
The root now comes from the engine (SNES_MOD_CATALOG_ROOT) rather than
being spelled out per title, so the two cannot drift apart again.