fix(wallet): correct change checks in transaction builder (#5235)

Description
---
Fix mislabelled transaction builder checks for change params

Motivation and Context
---
Previous code just checked the private nonce 3 times
```rust
        Self::check_value("Change script", &self.private_nonce, &mut message);
        Self::check_value("Change input data", &self.private_nonce, &mut message);
        Self::check_value("Change script private key", &self.private_nonce, &mut message);
```

None of the change builder fields are required.

How Has This Been Tested?
---
N/A Change has no effect on builder behaviour

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base_layer/core/src/transactions/transaction_protocol/transaction_initializer.rs

@@ -488,9 +488,7 @@ impl SenderTransactionInitializer {
         Self::check_value("Missing Lock Height", &self.lock_height, &mut message);
         Self::check_value("Missing Fee per gram", &self.fee_per_gram, &mut message);
         Self::check_value("Missing Offset", &self.offset, &mut message);
-        Self::check_value("Change script", &self.private_nonce, &mut message);
-        Self::check_value("Change input data", &self.private_nonce, &mut message);
-        Self::check_value("Change script private key", &self.private_nonce, &mut message);
+        Self::check_value("Missing private nonce", &self.private_nonce, &mut message);
 
         if !message.is_empty() {
             return self.build_err(&message.join(","));
@@ -731,8 +729,7 @@ mod test {
         // We should have a bunch of fields missing still, but we can recover and continue
         assert_eq!(
             err.message,
-            "Missing Lock Height,Missing Fee per gram,Missing Offset,Change script,Change input data,Change script \
-             private key"
+            "Missing Lock Height,Missing Fee per gram,Missing Offset,Missing private nonce"
         );
 
         let mut builder = err.builder;