Fix crash caused by target id panels

I've honestly got no idea what the root cause is, but this fixes it

Author: ReplayCoding

src/game/client/tf/tf_hud_target_id.cpp

@@ -113,6 +113,7 @@ CTargetID::CTargetID( const char *pElementName ) :
 	m_hFont = g_hFontTrebuchet24;
 	m_flLastChangeTime = 0;
 	m_iLastEntIndex = 0;
+	m_iTargetEntIndex = 0;
 	m_nOriginalY = 0;
 	m_bArenaPanelVisible = false;