fix: panic on bot_takeover events

[akiver]

The demo from this issue has the problem described and fixed in this PR.

The other PR fixes the first panic, but another happens due to a missing prop when a player takes control of a bot.

The prop m_iControlledBotEntIndex expected in player.ControlledBot() doesn't exist in CS2 demos.
As a replacement I use the prop m_hOriginalControllerOfCurrentPawn.

I also had to change the signature of FindPlayerByHandle to FindPlayerByHandle(handle uint64) *Player since the controllers are uin64 values.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0ac0c4b) 80.67% compared to head (60a3075) 80.67%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #491   +/-   ##
=======================================
  Coverage   80.67%   80.67%           
=======================================
  Files          47       47           
  Lines        6327     6330    +3     
=======================================
+ Hits         5104     5107    +3     
  Misses       1014     1014           
  Partials      209      209           

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