Removing one more hardcoded text line from core scripts.
Also adding correct gossip to the npc_grandmother script.
Gossip changes in this script:
- remove hardcoded text from core script
- use existing npc_text IDs in gossip enum
- add missing text rows to gossip_menu_option
- use values from gossip_menu_option in enum
- replace spawn coordinates 0.0f with GetPosition()