fix: parameters are vector of Num instead of vector of pairs

Author: Sathvik Bhagavan

src/systems/pde/pdesystem.jl

@@ -113,7 +113,7 @@ struct PDESystem <: ModelingToolkit.AbstractMultivariateSystem
             if isnothing(analytic_func)
                 analytic_func = map(analytic) do eq
                     args = arguments(eq.lhs)
-                    p = ps isa SciMLBase.NullParameters ? [] : map(a -> a.first, ps)
+                    p = ps isa SciMLBase.NullParameters ? [] : ps
                     args = vcat(DestructuredArgs(p), args)
                     ex = Func(args, [], eq.rhs) |> toexpr
                     eq.lhs => drop_expr(@RuntimeGeneratedFunction(eval_module, ex))