Replace UTXO::is_internal with script_type

This means less conversion and logic mapping from bool to ScriptType and
back again.

src/blockchain/compact_filters/mod.rs

@@ -193,7 +193,7 @@ impl CompactFiltersBlockchain {
                 updates.set_utxo(&UTXO {
                     outpoint: OutPoint::new(tx.txid(), i as u32),
                     txout: output.clone(),
-                    is_internal: script_type.is_internal(),
+                    script_type,
                 })?;
                 incoming += output.value;
 

src/blockchain/utils.rs

@@ -358,7 +358,7 @@ fn save_transaction_details_and_utxos<D: BatchDatabase>(
             updates.set_utxo(&UTXO {
                 outpoint: OutPoint::new(tx.txid(), i as u32),
                 txout: output.clone(),
-                is_internal: script_type.is_internal(),
+                script_type,
             })?;
 
             incoming += output.value;