Fix Crash when hovering over the PvP toggle while having Shaper Beam (#10244)

Fixes the crash when you hover over the PvP toggle while having the Shaper Beam skill selected
The skill uses the `DamageOverTime` config so `output.enemySkillTime` is never set so when the PvP calcs expect to find it they instead get a nil crash

Co-authored-by: LocalIdentity <localidentity2@gmail.com>

Author: LocalIdentity

src/Modules/CalcDefence.lua

@@ -3075,7 +3075,7 @@ function calcs.buildDefenceEstimations(env, actor)
 
 	-- pvp
 	if env.configInput.PvpScaling then
-		local PvpTvalue = output.enemySkillTime
+		local PvpTvalue = output.enemySkillTime or 1
 		local PvpMultiplier = (env.configInput.enemyMultiplierPvpDamage or 100) / 100
 
 		local PvpNonElemental1 = data.misc.PvpNonElemental1