fix: max_note_len computation (#10438)

We were simply adding all note lengths instead of finding the largest
one, resulting in an unncessarily large array. I couldn't think of a
simple and robust way to write a test for this so I just didn't, but I
did check manually that it does what you'd expect.

noir-projects/aztec-nr/aztec/src/macros/mod.nr

@@ -114,7 +114,11 @@ comptime fn generate_compute_note_hash_and_optionally_a_nullifier() -> Quoted {
         max_note_length = notes.fold(
             0,
             |acc, (_, (_, len, _, _)): (Type, (StructDefinition, u32, Field, [(Quoted, u32, bool)]))| {
-                acc + len
+                if len > acc {
+                    len
+                } else {
+                    acc
+                }
             },
         );