Fix ancilla chat var ref (#78848)

Use consistent var name to be able to chat about the LIXA mission with Hub mercenaries

data/json/npcs/robofac/robofac_ancilla_npcs/BAR_ENCOUNTER_MERCENARIES/BEM_chatting_veterans.json

@@ -95,7 +95,7 @@
       },
       {
         "text": "Tell them the story of how you were trapped in an infinitely looping corridor, fighting the warped remnants of the researchers there and somehow the damned corridor itself.  And at the end of the day, you're not even sure the headache was worth it.",
-        "condition": { "compare_string": [ "yes", { "u_val": "dialogue_intercom_completed_robofac_lixa_sm_1" } ] },
+        "condition": { "compare_string": [ "yes", { "u_val": "dialogue_intercom_completed_robofac_intercom_lixa_sm_1" } ] },
         "topic": "BEM_CHATTING_VETERANS_TELL_STORY_LIXA"
       },
       {