els_cursor: Fix a compiler warning for Wayland support

els_cursor: Fix a compiler warning for Wayland support

Summary:
`_curosors` is not used when Elementary is compiled for Wayland.
It Fixes a compiler warning.
```
../src/lib/elementary/els_cursor.c:46:26: warning: ‘_cursors’ defined but not used [-Wunused-variable]
 static struct _Cursor_Id _cursors[] =

```

Test Plan: meson build -Dx11=false -Dwl=true

Reviewers: zmike, Hermet, Jaehyun_Cho

Reviewed By: Hermet

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D11360