Solari: Make light tiles properly random

[JMS55]

Objective

• Due to reusing the same constant in presample_light_tiles RNG as I used in the frame_index RNG, the light tiles were not properly random. Tile N+1 on frame X+1 would use the same pool of light as tile N on frame X - it was just "scrolling" each frame.

Solution

• Use a different constant to properly randomize the pool