CharacterCore::m_HookTick should have type Duration not Instant despite name

[Zwelf]

m_HookTick has the type NetTick in protocol.py, but is used as HookDuration. Starting with zero and incrementing one each tick until the roughly 60 ticks = 1.2s are passed.

• ddnet
• teeworlds

libtw2 uses the Instant type, but Duration would be more correct.

• ddnet
• teeworlds-0.7
• teeworlds-0.6
• teeworlds-0.5