Issue 18332 - rt.util.random.Rand48 remove unnecessary assert

[n8sh]

There is no need for seedval to be non-zero. The assertion should be removed.

[dlang-bot]

Thanks for your pull request, @n8sh! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.

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Bugzilla references

Auto-close	Bugzilla	Description
✗	18332	rt.util.random.Rand48 remove unnecessary assert

[wilzbach]

Thanks. Sorry that this PR got lost. Druntime seems to be low-traffic at the moment.