test: fix dd seting

Author: MilesCranmer

test/runtests.jl

@@ -18,7 +18,7 @@ end
 if "jet" in test_name
     @safetestset "JET" begin
         using Preferences
-        set_preferences!("DynamicExpressions", "instability_check" => "disable"; force=true)
+        set_preferences!("DynamicExpressions", "dispatch_doctor_mode" => "disable"; force=true)
         using JET
         using DynamicExpressions
         struct MyIgnoredModule