Core/Units: Include SPELL_AURA_MOD_FACTION auras when restoring faction (either on aura removal or .gm off)

Port From (https://github.com/TrinityCore/TrinityCore/commit/52fb46703172a0803a122d54aaed6506eb25d3e3)

Source/Game/Entities/Player/Player.cs

@@ -2192,7 +2192,7 @@ namespace Game.Entities
                 PhasingHandler.SetAlwaysVisible(this, HasAuraType(AuraType.PhaseAlwaysVisible), false);
 
                 m_ExtraFlags &= ~PlayerExtraFlags.GMOn;
-                SetFactionForRace(GetRace());
+                RestoreFaction();
                 RemovePlayerFlag(PlayerFlags.GM);
                 RemoveUnitFlag2(UnitFlags2.AllowCheatSpells);
 

Source/Game/Entities/Unit/Unit.cs

@@ -2107,6 +2107,12 @@ namespace Game.Entities
 
         public void RestoreFaction()
         {
+            if (HasAuraType(AuraType.ModFaction))
+            {
+                SetFaction((uint)GetAuraEffectsByType(AuraType.ModFaction).LastOrDefault().GetMiscValue());
+                return;
+            }
+
             if (IsTypeId(TypeId.Player))
                 ToPlayer().SetFactionForRace(GetRace());
             else