Fix validator lookup by title.

We want the lookup to yield a result when there's only a single
  validator; and no title is provided. So that users can simply do
  'aiken address' in their project if it's unambiguous. The validator's
  name is only required to disambiguate between multiple validators.

  I also noticed that the order of arguments in with_validator was
  wrong. Somehow.

crates/aiken-lang/src/uplc.rs

@@ -820,6 +820,7 @@ impl<'a> CodeGenerator<'a> {
                         }
                     };
 
+                    #[allow(clippy::bool_to_int_with_if)]
                     let minus_tail = if has_tail { 1 } else { 0 };
 
                     if current_clause_index as i64 - minus_tail == prev_index {