core: fix events.BombPlantBegin.Site being off for new demos

[markus-wa]

old demos had the site attirbute as short, new demos seem to have it as a long

[codecov]

Codecov Report

Merging #313 (8e787ce) into master (041838a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
+ Coverage   92.56%   92.58%   +0.01%     
==========================================
  Files          30       30              
  Lines        3012     3019       +7     
==========================================
+ Hits         2788     2795       +7     
  Misses        169      169              
  Partials       55       55              

Impacted Files	Coverage Δ
pkg/demoinfocs/game_events.go	94.38% <100.00%> (+0.05%)	⬆️
pkg/demoinfocs/parser.go	81.14% <100.00%> (+0.31%)	⬆️

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