Basic async_work_group_copy_fence_import_after_export_aliased_local tests wait on wrong number of events

In many kernels used by cl_khr_async_work_group_copy_fence there is a call to wait_group_events on 2 events even though only 1 event is given.

```c++
wait_group_events( 2, &events )
```

I believe this is a bug in the kernel and should be instead

```c++
wait_group_events( 1, &events )
```

Search the OpenCL-CTS tests for the async_work_group_copy_fence_import_after_export_aliased_local kernels and the shown wait_group_events call. Check each occurrence against the number of supplied events, update the affected tests, and run the corresponding conformance tests to verify they pass.

Written by the indexing model from the issue text.