Readd restore code.

diff --git a/core.lua b/core.lua
index a9d0611..44088e4 100644
--- a/core.lua
+++ b/core.lua
@@ -1725,7 +1725,7 @@ do
 					CollapseTradeSkillSubClass(i)
 				end
 			end
---[[
+
 			-- Restore the state of the "Have Materials" checkbox.
 			TradeSkillFrame.filterTbl.hasMaterials = have_materials
 			TradeSkillOnlyShowMakeable(have_materials)
@@ -1735,7 +1735,7 @@ do

 			TradeSkillUpdateFilterBar()
 			TradeSkillFrame_Update()
-]]--
+
 		end
 		Player.prev_count = Player.foundRecipes
 		Player.foundRecipes = recipes_found