Make powerups HUD toggleable via Lua (again)

MIDIManrequested to merge
MIDIMan/SRB2:disable-powerup-hud into next

srb20011

This adds "powerups" to the list of HUD elements that can be enabled/disabled with the hud.enable and hud.disable functions in Lua.

Test WAD: DisablePowerupTest.wad

EDIT: Updated the test WAD to accommodate the latest commit(s)

Edited by MIDIMan

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