fix: preserve explicit nonce in fillTransaction (#4518)

* fix: preserve explicit nonce in fillTransaction

* Delete src/actions/public/fillTransaction.regression.test.ts

* Preserve explicit nonce in fillTransaction

---------

Co-authored-by: jxom <7336481+jxom@users.noreply.github.com>

Author: RekCuy63

.changeset/thin-books-swim.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Preserved explicit `nonce` in `fillTransaction`.

src/actions/public/fillTransaction.ts

@@ -207,7 +207,7 @@ export async function fillTransaction<
     if (transaction.maxPriorityFeePerGas)
       transaction.maxPriorityFeePerGas =
         parameters.maxPriorityFeePerGas ?? transaction.maxPriorityFeePerGas
-    if (transaction.nonce)
+    if (typeof transaction.nonce !== 'undefined')
       transaction.nonce = parameters.nonce ?? transaction.nonce
 
     // Build fee multiplier function.