Fix breakable objects reflecting the Gauss Gun shot that breaks them

[Toodles2You]

This is a very specific quirk that I discovered while testing other changes. The Gauss Gun will kill breakables, resulting in the pev->takedamage field being set to 0. The ReflectGauss member is called after this occurs, which then checks the pev->takedamage field, finds that the breakable doesn't take damage and reflects the shot.

https://github.com/SamVanheer/halflife-updated/blob/master/dlls/gauss.cpp#L400 https://github.com/SamVanheer/halflife-updated/blob/master/dlls/gauss.cpp#L407

The new override members should always ensure the intended behavior.