Blender Git Loki

Fix T64138: Windows Ink continuous grab at window edge.

WM_POINTERLEAVE occurs when the pen goes out of range or when a
hovering pen leaves the window's boundary. When leaving the window
boundary the xy position is invalid for some Wacom devices.

This change removes creation of GHOST_EventCursor during
WM_POINTERLEAVE events. This prevents unexpected jumping behavior
during continuous grab.