Daniel van Vugt b2805dd5a6 clutter/pick-stack: Avoid uninitialized cairo_region_subtract_rectangle
This fixes instances of:
```
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug
```
seen when navigating the overview and launching apps.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2349>
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