[Issue 18332] rt.util.random.Rand48 remove unnecessary assert

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18332

--- Comment #1 from Nathan S. <n8sh.secondary at hotmail.com> ---
Strike the comments about popFront(): the mask is necessary.

>popFront() advances rng_state through addition and multiplication so the high 16 bits of the current rng_state never affect the low 48 bits of the next rng_state

The "and addition" is why this statement is false.

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