test: Fix a compiler warning if e2e-encryption and experimental-sliding-sync aren't enabled.

crates/matrix-sdk-base/src/client.rs

@@ -1675,6 +1675,8 @@ mod tests {
     #[cfg(all(feature = "e2e-encryption", feature = "experimental-sliding-sync"))]
     #[async_test]
     async fn test_when_there_are_no_latest_encrypted_events_decrypting_them_does_nothing() {
+        use crate::StateChanges;
+
         // Given a room
         let user_id = user_id!("@u:u.to");
         let room_id = room_id!("!r:u.to");
@@ -1686,7 +1688,7 @@ mod tests {
         assert!(room.latest_event().is_none());
 
         // When I tell it to do some decryption
-        let mut changes = crate::StateChanges::default();
+        let mut changes = StateChanges::default();
         client.decrypt_latest_events(&room, &mut changes).await;
 
         // Then nothing changed