Core/Spells: Implemented Improved Faerie Fire crit chance increase effect

Signed-off-by: Machiavelli <machiavelli.trinity@gmail.com>

src/server/game/Entities/Unit/Unit.cpp

@@ -10585,6 +10585,13 @@ bool Unit::isSpellCrit(Unit *pVictim, SpellEntry const *spellProto, SpellSchoolM
                 switch (spellProto->SpellFamilyName)
                 {
                     case SPELLFAMILY_DRUID:
+                        // Improved Faerie Fire
+                        if (pVictim->HasAuraState(AURA_STATE_FAERIE_FIRE))
+                            if (AuraEffect const * aurEff = GetDummyAuraEffect(SPELLFAMILY_DRUID, 109, 0))
+                                crit_chance+=aurEff->GetAmount();
+
+                        // cumulative effect - don't break
+
                         // Starfire
                         if (spellProto->SpellFamilyFlags[0] & 0x4 && spellProto->SpellIconID == 1485)
                         {