fixup! refactor: improve replace, remake_buffer

Author: AayushSabharwal

src/systems/parameter_buffer.jl

@@ -192,7 +192,7 @@ for (Portion, field) in [(SciMLStructures.Tunable, :tunable)
     end
 
     @eval function SciMLStructures.replace!(::$Portion, p::MTKParameters, newvals)
-        update_tuple_of_buffers(new_val, p.$field)
+        update_tuple_of_buffers(newvals, p.$field)
         if p.dependent_update_iip !== nothing
             p.dependent_update_iip(ArrayPartition(p.dependent), p...)
         end