fix a bug where the challenge is reset after asw_mission_restart

Author: mithrand0

src/game/shared/swarm/asw_gamerules.cpp

@@ -9932,9 +9932,11 @@ void CAlienSwarm::EnableChallenge( const char *szChallengeName )
 	KeyValues::AutoDelete pKV( "CHALLENGE" );
 	bool bEnabled = ReactiveDropChallenges::ReadData( pKV, szChallengeName );
 
-	rd_challenge.SetValue("");
-	ResetChallengeConVars();
-	rd_challenge.SetValue(szChallengeName);
+	if ( bChanged ) {
+		rd_challenge.SetValue("0");
+		ResetChallengeConVars();
+		rd_challenge.SetValue(szChallengeName);
+	}
 
 	if ( ASWDeathmatchMode() )
 	{
@@ -9956,7 +9958,6 @@ void CAlienSwarm::EnableChallenge( const char *szChallengeName )
 	if ( bEnabled )
 	{
 		ApplyChallengeConVars( pKV );
-		EnforceWeaponSelectionRules();
 	}
 
 	if ( !bEnabled )
@@ -9975,6 +9976,7 @@ void CAlienSwarm::EnableChallenge( const char *szChallengeName )
 	// if rd_max_marines changed we need to update marines limits using SetMaxMarines
 	SetMaxMarines();
 	EnforceMaxMarines();
+	EnforceWeaponSelectionRules();
 	OnSkillLevelChanged( m_iSkillLevel );
 
 	if ( V_strcmp( rd_challenge.GetString(), "0" ) )