fix: refactor modelingtoolkitize(::OptimizationProblem) to use new codegen

Author: AayushSabharwal

src/systems/optimization/modelingtoolkitize.jl

@@ -79,7 +79,11 @@ function modelingtoolkitize(prob::DiffEqBase.OptimizationProblem;
 
     if DiffEqBase.isinplace(prob) && !isnothing(prob.f.cons)
         lhs = Array{Num}(undef, num_cons)
-        prob.f.cons(lhs, vars, params)
+        if p isa MTKParameters
+            prob.f.cons(lhs, vars, params...)
+        else
+            prob.f.cons(lhs, vars, params)
+        end
         cons = Union{Equation, Inequality}[]
 
         if !isnothing(prob.lcons)
@@ -108,7 +112,8 @@ function modelingtoolkitize(prob::DiffEqBase.OptimizationProblem;
             or pass the lower and upper bounds for inequality constraints."))
         end
     elseif !isnothing(prob.f.cons)
-        cons = prob.f.cons(vars, params)
+        cons = p isa MTKParameters ? prob.f.cons(vars, params...) :
+               prob.f.cons(vars, params)
     else
         cons = []
     end