Update DelayLti/HammersteinWiener print tests for new D format

Same trailing-blank-line drop as the existing StateSpace print tests —
these composite types embed the StateSpace show output.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: baggepinnen

lib/ControlSystemsBase/test/test_delayed_systems.jl

@@ -14,7 +14,7 @@ using ControlSystemsBase
 @test_throws ErrorException delay(1, 0.3)
 @test delay(1, 1) == ss(zeros(1,1), ones(1,1), ones(1,1), zeros(1,1), 1)
 
-@test sprint(show, ss(1,1,1,1)*delay(1.0)) == "DelayLtiSystem{Float64, Float64}\n\nP: StateSpace{Continuous, Float64}\nA = \n 1.0\nB = \n 0.0  1.0\nC = \n 1.0\n 0.0\nD = \n 0.0  1.0\n 1.0  0.0\n\nContinuous-time state-space model\n\nDelays: [1.0]"
+@test sprint(show, ss(1,1,1,1)*delay(1.0)) == "DelayLtiSystem{Float64, Float64}\n\nP: StateSpace{Continuous, Float64}\nA = \n 1.0\nB = \n 0.0  1.0\nC = \n 1.0\n 0.0\nD = \n 0.0  1.0\n 1.0  0.0\nContinuous-time state-space model\n\nDelays: [1.0]"
 
 # Extremely basic tests
 @test freqresp(delay(1), ω) ≈ reshape(exp.(-im*ω), 1, 1, length(ω)) rtol=1e-15

lib/ControlSystemsBase/test/test_hammerstein_wiener.jl

@@ -14,7 +14,7 @@ using Test
 @test typeof(promote(nonlinearity(abs2), ss(1))[1]) == HammersteinWienerSystem{Float64}
 
 @test sprint(show, ss(1, 1, 1, 1) * nonlinearity(abs2)) ==
-      "HammersteinWienerSystem{Float64}\n\nP: StateSpace{Continuous, Float64}\nA = \n 1.0\nB = \n 0.0  1.0\nC = \n 1.0\n 0.0\nD = \n 0.0  1.0\n 1.0  0.0\n\nContinuous-time state-space model\n\nNonlinearities: Function[abs2]"
+      "HammersteinWienerSystem{Float64}\n\nP: StateSpace{Continuous, Float64}\nA = \n 1.0\nB = \n 0.0  1.0\nC = \n 1.0\n 0.0\nD = \n 0.0  1.0\n 1.0  0.0\nContinuous-time state-space model\n\nNonlinearities: Function[abs2]"
 
 
 P1 = HammersteinWienerSystem(ss(-1.0, 1, 1, 0))