AGI: Remove obsolete TODO

We now set the play time - commit 5e10737015faa15d225f70b364096982923eb415
AGI: Fix bug #3600733 - "AGI FANMADE: function slowing down game"

We now only test for events in testKeypressed() without updating the
game cycle at all (NAGI doesn't update the game cycle either). This
fixes the slowdowns in some animations where have.key() is issued,
like Manannan's lightnings in the intro of KQ3 and the bullets in the
intro of PQ1