Consider all_scripts for smartness of transaction (#323)

Previously reference scripts were ignored

Author: nielstron

pycardano/txbuilder.py

@@ -1021,7 +1021,7 @@ def build(
         self._ensure_no_input_exclusion_conflict()
 
         # only automatically set the validity interval and required signers if scripts are involved
-        is_smart = bool(self.scripts)
+        is_smart = bool(self.all_scripts)
 
         # Automatically set the validity range to a tight value around transaction creation
         if (