Learning a talent from tree still locked from an escort will not reset mastery

git-svn-id: http://svn.net-core.org/repos/t-engine4@6340 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/chats/escort-quest.lua

@@ -274,7 +274,7 @@ local function generate_rewards()
 						on_select=function(npc, player)
 							game.tooltip_x, game.tooltip_y = 1, 1
 							local mastery = nil
-							if not player:knowTalentType(t.type[1]) then mastery = 0.8 end
+							if player:knowTalentType(t.type[1]) == nil then mastery = 0.8 end
 							game:tooltipDisplayAtMap(game.w, game.h, "#GOLD#"..t.name.."#LAST#\n"..tostring(player:getTalentFullDescription(t, 1, nil, mastery)))
 						end,
 					}