fix emoji support in autofmt

packages/autofmt/src/util.rs

@@ -1,14 +1,17 @@
 pub fn find_bracket_end(contents: &str) -> Option<usize> {
     let mut depth = 0;
 
-    for (i, c) in contents.chars().enumerate() {
+    let mut len = 0;
+
+    for c in contents.chars() {
+        len += c.len_utf8();
         if c == '{' {
             depth += 1;
         } else if c == '}' {
             depth -= 1;
 
             if depth == 0 {
-                return Some(i);
+                return Some(len);
             }
         }
     }