Add spheres support for "NoInteriorMusic"

[Lordmau5]

By adding spheres support for the NoInteriorMusic setting it will also disable the music that plays at the van in Life's A Beach and presumably the lowrider meetup in Cesar Vialpando.

Similar to how the NOPs are done here, adding the following 2 lines will also NOP the spheres (since the game has both boxes and spheres for audio zones)

MakeNOP (0x50844A, 6, true);
MakeNOP (0x5084B0, 6, true);

Alternatively, an extra setting might be cool - The song at the van definitely is causing copyright issues on YouTube, so having an option to disable that might be a nice addition :)