Renderer Viewport correct sizeof usage.

The current usage.

In viewport_find_from_screen_attachment
- Allocates a list of pointers, eg sizeof(RID*) * ridcount.

We need fill that buffer
viewport_owner.fill_owned_buffer(rids);
...
 p_rid_buffer[idx] = _make_from_id((validator << 32) | i);

_make_from_id returns an RID object, not a pointer.

Since there isn't a copy constructor, a bitwise copy of the object occurs.

This issue will only present itself under 32bit builds.
sizeof(RID)  : 8
sizeof(RID*) : 4

whereas 64bit builds they are both 8.

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