Fix timeless jewel trade league url (#7565)

* Update TreeTabClass to default to the first league in the dropdown if no league was selected.

* Restore the last used league on window open

src/Classes/TreeTab.lua

@@ -1794,6 +1794,13 @@ function TreeTabClass:FindTimelessJewel()
 	controls.msg = new("LabelControl", nil, -280, 5, 0, 16, "")
 	if #self.tradeLeaguesList > 0 then
 		controls.searchTradeLeagueSelect:SetList(self.tradeLeaguesList)
+		-- restore the last league selected
+		for i, league in ipairs(self.tradeLeaguesList) do
+			if league == self.timelessJewelLeagueSelect then
+				controls.searchTradeLeagueSelect:SetSel(i)
+				break
+			end
+		end
 	else
 		self.tradeQueryRequests:FetchLeagues("pc", function(leagues, errMsg)
 			if errMsg then
@@ -1904,7 +1911,10 @@ function TreeTabClass:FindTimelessJewel()
 			end
 		end
 
-		Copy("https://www.pathofexile.com/trade/search/"..(self.timelessJewelLeagueSelect or "").."/?q=" .. (s_gsub(dkjson.encode(search), "[^a-zA-Z0-9]", function(a)
+		-- if the league was not selected via dropdown, then default to the first league in the dropdown or "" if the leagues could not be read
+		self.timelessJewelLeagueSelect = self.timelessJewelLeagueSelect or (self.tradeLeaguesList and #self.tradeLeaguesList > 0 and self.tradeLeaguesList[1]) or ""
+
+		Copy("https://www.pathofexile.com/trade/search/"..(self.timelessJewelLeagueSelect).."/?q=" .. (s_gsub(dkjson.encode(search), "[^a-zA-Z0-9]", function(a)
 			return s_format("%%%02X", s_byte(a))
 		end)))