test: use Base.ifelse in Chua circuit

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>

Author: ChrisRackauckas

test/chua_circuit.jl

@@ -6,7 +6,6 @@ using ModelingToolkitStandardLibrary.Electrical: OnePort
 using OrdinaryDiffEq
 using OrdinaryDiffEq: ReturnCode.Success
 using OrdinaryDiffEqRosenbrock: Rodas4
-using IfElse: ifelse
 
 @testset "Chua Circuit" begin
     @component function NonlinearResistor(; name, Ga, Gb, Ve)