[TF2] Fix Huo-Long Heater and Sharpened Volcano Fragment not extending afterburn duration against victims who are already on fire

[num-get]

Description

Huo-Long Heater and Sharpened Volcano Fragment use GetInitialAfterburnDuration() instead of GetAfterburnRateOnHit() which cause those weapons to lose the ability to extend afterburn duration against burning players.

source-sdk-2013/src/game/shared/tf/tf_player_shared.cpp

Lines 6645 to 6650 in 3300848

	if ( !InCond( TF_COND_BURNING ) )
	{
	// Start burning
	AddCond( TF_COND_BURNING, -1.f, pAttacker );
	m_flFlameBurnTime = gpGlobals->curtime + TF_BURNING_FREQUENCY;
	m_flAfterburnDuration = pWeapon ? pWeapon->GetInitialAfterburnDuration() : 0.f;

Before:

2026-04-21.15-35-30.mp4

2026-04-21.15-36-29.mp4

After:

2026-04-21.15-48-46.mp4

ezgif-64d2cc4f7c6e33ee.mp4