fix(clippy): replace match with if let for single pattern

Fixes clippy::single_match warning in profile_linter.rs by
using if let instead of match for single pattern destructuring.

https://claude.ai/code/session_01U8AKLUWvrAE2w6Ey63qDGQ

Author: claude

crates/flight-profile/src/profile_linter.rs

@@ -583,11 +583,8 @@ fn set_path(root: &mut Value, path: &str, value: Value) {
             }
             current = &mut arr[i];
         } else if is_last {
-            match current {
-                Value::Object(map) => {
-                    map.insert((*part).to_string(), value);
-                }
-                _ => {}
+            if let Value::Object(map) = current {
+                map.insert((*part).to_string(), value);
             }
             return;
         } else {