learning a talent type sets its mastery to 1 if not set

git-svn-id: http://svn.net-core.org/repos/t-engine4@679 51575b47-30f0-44d4-a5cc-537603b46e54

game/engine/interface/ActorTalents.lua

@@ -411,6 +411,7 @@ end
 function _M:learnTalentType(tt, v)
 	if v == nil then v = true end
 	self.talents_types[tt] = v
+	self.talents_types_mastery[tt] = self.talents_types_mastery[tt] or 1
 	self.changed = true
 	return true
 end