Fix again the tests...

Author: amontoison

test/zygote.jl

@@ -49,7 +49,7 @@ test_autodiff_backend_error()
 
 # Additional backends used for tests
 push!(ADNLPModels.predefined_backend,
-  Dict(:zygote_backend => Dict(
+  :zygote_backend => Dict(
     :gradient_backend => ADNLPModels.ZygoteADGradient,
     :jprod_backend => ADNLPModels.ZygoteADJprod,
     :jtprod_backend => ADNLPModels.ZygoteADJtprod,