Fix titan-only boosts for modes like LTS

[ASpoonPlaysGames]

Hopefully closes #667

The original check Respawn did for this was:

if ( Riff_TitanAvailability() == eTitanAvailability.Never )
{
	//JFS: Batteries and Titan turrets are useless in PvP, turn them into amped weapons instead. Not an elegant solution at all. Fix next game. (Make boosts editable mid-match? )
	if ( ref == "burnmeter_emergency_battery" || ref == "burnmeter_at_turret_weapon"  )
		ref = "burnmeter_amped_weapons"
}

This was changed in #71 to the current check, which is incorrect.

This PR will need testing, unfortunately it is hard to test LTS by myself. We need to ensure that titans cannot be earned in LTS.

[NoCatt]

Looks good, essentially the same thing but rules out more errors, as its guaranteed that you can't spawn Titan in.
Will be testing later today

[catornot]

code looks good.

tested this pr with bots couldn't get a new titan in lts and boosts didn't transfer over matches.

[GeckoEidechse]

Merging based on reviews.