Update passing constraints from ConstrolSystem and test loss value

Author: Vaibhavdixit02

src/systems/control/controlsystem.jl

@@ -223,6 +223,6 @@ function runge_kutta_discretize(sys::ControlSystem, dt, tspan;
                       reduce(vcat, reduce(vcat, control_timeseries)))
 
     OptimizationSystem(reduce(+, losses, init = 0), opt_states, ps,
-                       equality_constraints = equalities, name = nameof(sys),
+                       constraints = equalities, name = nameof(sys),
                        checks = false)
 end

test/controlsystem.jl

@@ -16,6 +16,7 @@ sys = runge_kutta_discretize(sys, dt, tspan)
 u0 = rand(length(states(sys))) # guess for the state values
 prob = OptimizationProblem(sys, u0, [0.1, 0.1], grad = true)
 sol = solve(prob, BFGS())
+@test prob.f(sol.minimizer, prob.p) < prob.f(u0, prob.p)
 
 # issue #819
 @testset "Combined system name collisions" begin