fix adjoint test

Author: jClugstor

lib/BracketingNonlinearSolve/test/adjoint_tests.jl

@@ -10,9 +10,9 @@
         return sum(abs2, res)
     end
 
-    p = [3.0, 2.0]
+    p = [2.0, 2.0]
 
-    ∂p_zygote = only(Zygote.gradient(solve_nlprob, p))
+    ∂p_zygote = Zygote.gradient(solve_nlprob, p)
     ∂p_forwarddiff = ForwardDiff.gradient(solve_nlprob, p)
     @test ∂p_zygote ≈ ∂p_forwarddiff
 end