Tap the spacer, that should get it unstuck. I wouldn't pry on it, this could damage the mating surface, and cause the wheel to be improperly aligned when you put it back on (however insignificant that may be).
The screw is probably in there tight, don't remember if it's reverse tread, so watch out.
PS: You're not actually removing the hub, just the brake rotor, hub stays on the control arm, along with the stub axle (only pulled out when doing rear bearings).
Ahmet
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