Fluffy State Bridge: State building fixes (#2589)

* Fix bug where code was not correctly being updated during contract creation.

* Delete value from update cache during db delete.

fluffy/tools/portal_bridge/state_bridge/database.nim

@@ -122,6 +122,9 @@ proc del(
 ): bool {.gcsafe, raises: [].} =
   if dbBackend.contains(key):
     doAssert dbBackend.tx.delete(key, dbBackend.cfHandle).isOk()
+
+    if not dbBackend.updatedCache.isNil():
+      dbBackend.updatedCache.del(key)
     true
   else:
     false

fluffy/tools/portal_bridge/state_bridge/world_state_helper.nim

@@ -52,15 +52,9 @@ proc applyStateDiff*(worldState: WorldStateRef, txDiff: TransactionDiff) =
 
     if nonceDiff.kind == create or nonceDiff.kind == update:
       accState.setNonce(nonceDiff.after)
-    elif nonceDiff.kind == delete:
-      doAssert deleteAccount == true
 
-    if codeDiff.kind == create and codeDiff.after.len() > 0:
+    if codeDiff.kind == create or codeDiff.kind == update:
       accState.setCode(codeDiff.after)
-    elif codeDiff.kind == update:
-      accState.setCode(codeDiff.after)
-    elif codeDiff.kind == delete:
-      doAssert deleteAccount == true
 
     for (slotKey, slotValueDiff) in storageDiff:
       if slotValueDiff.kind == create or slotValueDiff.kind == update: