use #[track_caller] in kitdiff

crates/egui_kittest/src/snapshot.rs

@@ -859,6 +859,7 @@ impl From<SnapshotResults> for Vec<SnapshotError> {
 }
 
 impl Drop for SnapshotResults {
+    #[track_caller]
     fn drop(&mut self) {
         // Don't panic if we are already panicking (the test probably failed for another reason)
         if std::thread::panicking() {