remove resize fixed size

Author: ChrisRackauckas

test/core_resizing.jl

@@ -24,10 +24,6 @@ end
 df1 = ForwardDiff.derivative(τ -> claytonsample!(stod, τ, 0.0), 0.3)
 @test size(randmat) == size(df1)
 
-stod = FixedSizeDiffCache(sto)
-ForwardDiff.derivative(τ -> claytonsample!(stod, τ, 0.0), 0.3)
-@test size(randmat) == size(df1)
-
 #calculating the jacobian of claytonsample! with respect to τ and α
 df2 = ForwardDiff.jacobian(x -> claytonsample!(stod, x[1], x[2]), [0.3; 0.0]) #should give a 15x2 array,
 #because ForwardDiff flattens the output of jacobian, see: https://juliadiff.org/ForwardDiff.jl/stable/user/api/#ForwardDiff.jacobian