Removed redundant rand for test model

[yebai]

This rand function is redundant with

DynamicPPL.jl/src/test_utils.jl

Lines 732 to 745 in 371b962

	function Base.rand(
	rng::Random.AbstractRNG, ::Type{NamedTuple}, model::MatrixvariateAssumeDemoModels
	)
	# Get template values from `model`.
	retval = model(rng)
	vals = (s=retval.s, m=retval.m)
	# Fill containers with realizations from prior.
	for i in LinearIndices(vals.s)
	vals.s[i] = rand(rng, InverseGamma(2, 3))
	vals.m[i] = rand(rng, Normal(0, sqrt(vals.s[i])))
	end
	return vals
	end

[github-actions]

Pull Request Test Coverage Report for Build 5691744443

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 75.47%

---

Totals
Change from base Build 5680643312:	0.2%
Covered Lines:	2086
Relevant Lines:	2764

---

💛 - Coveralls

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.16% 🎉

Comparison is base (8440c61) 75.30% compared to head (371b962) 75.47%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #507      +/-   ##
==========================================
+ Coverage   75.30%   75.47%   +0.16%     
==========================================
  Files          23       23              
  Lines        2770     2764       -6     
==========================================
  Hits         2086     2086              
+ Misses        684      678       -6     

Files Changed	Coverage Δ
src/test_utils.jl	84.65% <ø> (+1.41%)	⬆️

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[torfjelde]

LGTM!:)