Minor bug fixes

[npc/cities/geffen.txt]
- fixed bug with Psychic Advisor (bugreport:7928)

[npc/quests/seals/megingard_seal.txt]
- fixed small bug with Librarian where he would spam the NPC dialogue
  because of a misplaced "next"

[npc/re/merchants/enchan_mora.txt]
- fixed bug with wrong enchants (bugreport:7930)