Fix #2104: fmt incorrectly using 1-indexing for columns (#2106)

* Fix #2104: fmt incorrectly using 1-indexing for columns

* Clippy...

packages/autofmt/tests/wrong/oneline-expand.rsx

@@ -0,0 +1,18 @@
+fn main() {
+    rsx! {
+        button {
+            id: "start_stop",
+            onclick: move |_| {
+                timer
+                    .with_mut(|t| {
+                        t
+                            .started_at = if t.started_at.is_none() {
+                            Some(Instant::now())
+                        } else {
+                            None
+                        };
+                    })
+            }
+        }
+    }
+}